diff --git a/Achievments/Achievment.cs b/Achievments/Achievment.cs
index ef4803f..448fd58 100644
--- a/Achievments/Achievment.cs
+++ b/Achievments/Achievment.cs
@@ -17,7 +17,7 @@ namespace NEG.Utils.Achievments
             {
                 if (instance == null)
                 {
-                    instance = AchievmentManager.Builder.FromDefaultConfig()
+                    instance = AchievmentManager.Builder.FromLabeledConfig(ConfigLabel)
                         .WithLabeledBackend(BackendLabel)
                         .Build();
                 }
@@ -32,17 +32,37 @@ namespace NEG.Utils.Achievments
             {
                 if(instance != null) 
                 {
-                    throw new ApplicationException("Achievments - Cannot set backend label, Managed already created");
+                    //Log + Quit helps debug builds
+                    Debug.LogError("Achievments - Cannot set backend label, Managed already created");
+                    Application.Quit(1);
                 }
                 if (backendLabel != null)
                 {
-                    throw new ApplicationException("Multiple AchievmentBackends enabled, this is not allowed");
+                    //Log + Quit helps debug builds
+                    Debug.LogError("Multiple AchievmentBackends enabled, this is not allowed");
+                    Application.Quit(1);
                 }
                 backendLabel = value;
             }
         }
         private static string backendLabel;
 
+        /// <summary>
+        /// You shouldn't have any reason to change this
+        /// Used for tests.
+        /// </summary>
+        public static string ConfigLabel
+        {
+            private get => configLabel;
+            set => configLabel = value;
+        }
+
+        /// <summary>
+        /// You shouldn't have any reason to change this
+        /// Used for tests.
+        /// </summary>
+        private static string configLabel = "Achivments";
+
         private static AchievmentManager instance;
 
         #region Achievment Manipulation (Sets, Gets)
@@ -56,7 +76,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id</remarks>
         public static bool IsCompleted(string id)
         {
-            return instance.IsCompleted(id);
+            return Instance.IsCompleted(id);
         }
 
         #region Toggle
@@ -68,7 +88,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool SetToggleAchivment(string id)
         {
-            return instance.SetToggleAchivment(id);
+            return Instance.SetToggleAchivment(id);
         }
 
         /// <summary>
@@ -79,7 +99,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool GetToggleState(string id)
         {
-            return instance.GetToggleState(id);
+            return Instance.GetToggleState(id);
         }
         #endregion
 
@@ -92,7 +112,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool SetIntProgress(string id, int progress)
         {
-            return instance.SetIntProgress(id, progress);
+            return Instance.SetIntProgress(id, progress);
         }
 
         /// <summary>
@@ -103,7 +123,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool ChangeIntProgress(string id, int delta)
         {
-            return instance.ChangeIntProgress(id, delta);
+            return Instance.ChangeIntProgress(id, delta);
         }
 
         /// <summary>
@@ -114,7 +134,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static int GetIntProgress(string id)
         {
-            return instance.GetIntProgress(id);
+            return Instance.GetIntProgress(id);
         }
         #endregion
 
@@ -127,7 +147,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool SetFloatProgress(string id, float progress)
         {
-            return instance.SetFloatProgress(id, progress);
+            return Instance.SetFloatProgress(id, progress);
         }
 
         /// <summary>
@@ -138,7 +158,7 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static bool ChangeFloatProgress(string id, float delta)
         {
-            return instance.ChangeFloatProgress(id, delta);
+            return Instance.ChangeFloatProgress(id, delta);
         }
 
         /// <summary>
@@ -149,10 +169,22 @@ namespace NEG.Utils.Achievments
         /// <remarks>throws an <see cref="AchievmentException"/> if there is no achievment under id or an <see cref="AchievmentTypeException"/> if achievment under id is of a different type</remarks>
         public static float GetFloatProgress(string id)
         {
-            return instance.GetFloatProgress(id);
+            return Instance.GetFloatProgress(id);
         }
         #endregion
         #endregion
 
+        #region Test Api
+        /// <summary>
+        /// You shouldn't have any reason to use this <br/>
+        /// Use at your own risk, may cause unexpected behaviour <br/>
+        /// Used for tests
+        /// </summary>
+        public static void NullifyInstance()
+        {
+            instance = null;
+        }
+        #endregion
+
     }
 }
\ No newline at end of file
diff --git a/Achievments/Backend/LoacalBaackend/LoaclBackendConfig.cs b/Achievments/Backend/LoacalBaackend/LocalBackendConfig.cs
similarity index 96%
rename from Achievments/Backend/LoacalBaackend/LoaclBackendConfig.cs
rename to Achievments/Backend/LoacalBaackend/LocalBackendConfig.cs
index 3431616..71b6e22 100644
--- a/Achievments/Backend/LoacalBaackend/LoaclBackendConfig.cs
+++ b/Achievments/Backend/LoacalBaackend/LocalBackendConfig.cs
@@ -9,7 +9,7 @@ using UnityEngine;
 namespace NEG.Utils.Achievments
 {
     [CreateAssetMenu(menuName = "Achievments/Config/Backend/Local")]
-    public class LoaclBackendConfig : ScriptableObject, IAchievmentBackendConfig
+    public class LocalBackendConfig : ScriptableObject, IAchievmentBackendConfig
     {
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterAssembliesLoaded)]
         private static void Init()
@@ -51,7 +51,7 @@ namespace NEG.Utils.Achievments
 
             achievmentObj["completed"] = true;
 
-            token.Replace(achievmentObj);
+            jobj[id] = achievmentObj;
 
             SaveJson(jobj);
         }
@@ -81,8 +81,7 @@ namespace NEG.Utils.Achievments
                     break;
             }
 
-
-            token.Replace(achievmentObj);
+            jobj[id] = achievmentObj;
 
             SaveJson(jobj);
         }
diff --git a/Achievments/Backend/LoacalBaackend/LoaclBackendConfig.cs.meta b/Achievments/Backend/LoacalBaackend/LocalBackendConfig.cs.meta
similarity index 100%
rename from Achievments/Backend/LoacalBaackend/LoaclBackendConfig.cs.meta
rename to Achievments/Backend/LoacalBaackend/LocalBackendConfig.cs.meta
diff --git a/Achievments/PlaymodeTests.meta b/Achievments/PlaymodeTests.meta
new file mode 100644
index 0000000..852d17f
--- /dev/null
+++ b/Achievments/PlaymodeTests.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: d7c140577a904c8419a760a8ac6133c7
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Achievments/PlaymodeTests/BackendTests.cs b/Achievments/PlaymodeTests/BackendTests.cs
new file mode 100644
index 0000000..f5e9f8e
--- /dev/null
+++ b/Achievments/PlaymodeTests/BackendTests.cs
@@ -0,0 +1,62 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using NUnit.Framework;
+using UnityEngine;
+
+namespace NEG.Utils.Achievments.Tests
+{
+    public class BackendTests
+    {
+        //If stests start to fail first make sure these are correct in relation to test config asset
+        public const string configLabel = "TestAchievments";
+        public const string backendLabel = "AchievmentsLocalTests";
+        public const string saveLocation = "./LocalAchievments/Tests.json";
+
+        public const string AchievmentIdToggle = "TOGGLE";
+        public const string AchievmentIdInt = "INT";
+        public const string AchievmentIdFloat = "FLOAT";
+
+        [OneTimeSetUp]
+        public void OneTtimeSetup()
+        {
+            Achievment.BackendLabel = backendLabel;
+            Achievment.ConfigLabel = configLabel;
+        }
+
+        [TearDown]
+        public void TearDown()
+        {
+            Achievment.NullifyInstance();
+            if (File.Exists(saveLocation))
+            {
+                File.Delete(saveLocation);
+            }
+        }
+
+        [Test]
+        public void ReadWrite()
+        {
+            //We assume that the achievments are set correctly because otherwise other tests would fail
+            Achievment.SetToggleAchivment(AchievmentIdToggle);
+            Achievment.SetIntProgress(AchievmentIdInt, 20);
+            Achievment.SetFloatProgress(AchievmentIdFloat, 20);
+
+            //We need to assume NullifyInstance works correctly because we dont have access to an AchievmentManager which has not syncked yet
+            Achievment.NullifyInstance();
+
+            Assert.IsTrue(Achievment.IsCompleted(AchievmentIdToggle));
+            Assert.AreEqual(Achievment.GetIntProgress(AchievmentIdInt), 20);
+            Assert.AreEqual(Achievment.GetFloatProgress(AchievmentIdFloat), 20, 0f);
+
+            Achievment.SetIntProgress(AchievmentIdInt, 30);
+            Achievment.SetFloatProgress(AchievmentIdFloat, 30);
+
+            Achievment.NullifyInstance();
+
+            Assert.AreEqual(Achievment.GetIntProgress(AchievmentIdInt), 30);
+            Assert.AreEqual(Achievment.GetFloatProgress(AchievmentIdFloat), 30, 0f);
+
+        }
+    }
+}
\ No newline at end of file
diff --git a/Achievments/PlaymodeTests/BackendTests.cs.meta b/Achievments/PlaymodeTests/BackendTests.cs.meta
new file mode 100644
index 0000000..a543b95
--- /dev/null
+++ b/Achievments/PlaymodeTests/BackendTests.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c09ce9536c2c5f541bb7d07d5eca1d69
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef b/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef
new file mode 100644
index 0000000..f8c24bd
--- /dev/null
+++ b/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef
@@ -0,0 +1,22 @@
+{
+    "name": "NEG.Utils.Achievments.Tests.Playmode",
+    "rootNamespace": "",
+    "references": [
+        "UnityEngine.TestRunner",
+        "UnityEditor.TestRunner",
+        "NEG.Utils.Achivments"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "nunit.framework.dll"
+    ],
+    "autoReferenced": false,
+    "defineConstraints": [
+        "UNITY_INCLUDE_TESTS"
+    ],
+    "versionDefines": [],
+    "noEngineReferences": false
+}
\ No newline at end of file
diff --git a/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef.meta b/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef.meta
new file mode 100644
index 0000000..1bb12eb
--- /dev/null
+++ b/Achievments/PlaymodeTests/NEG.Utils.Achievments.Tests.Playmode.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 38e8b1e483202e14182d34baaea3958e
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Achievments/PlaymodeTests/TestAssets.meta b/Achievments/PlaymodeTests/TestAssets.meta
new file mode 100644
index 0000000..ebead8c
--- /dev/null
+++ b/Achievments/PlaymodeTests/TestAssets.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: fad16eb700fc70c408c359dca9a76fc9
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset b/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset
new file mode 100644
index 0000000..5cb8195
--- /dev/null
+++ b/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset
@@ -0,0 +1,15 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 6a1257a87feec064697193df412554d4, type: 3}
+  m_Name: TestLocalBackend
+  m_EditorClassIdentifier: 
+  saveLocation: ./LocalAchievments/Tests.json
diff --git a/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset.meta b/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset.meta
new file mode 100644
index 0000000..dd21e44
--- /dev/null
+++ b/Achievments/PlaymodeTests/TestAssets/TestLocalBackend.asset.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 47c9689c811dc9842a5a5e9ca19c6e3c
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 11400000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Achievments/TODO.txt b/Achievments/TODO.txt
index bce4482..ca82cc6 100644
--- a/Achievments/TODO.txt
+++ b/Achievments/TODO.txt
@@ -1,5 +1,5 @@
-Static Achievments class
+Static Achievments class (done)
 Implement Storage again API (done)
-Fix typos
+Fix typos 
 Merge AchievmentCollection with AchievmentManagerConfig (done)
-Static backend constructors
\ No newline at end of file
+Static backend constructors (done)
\ No newline at end of file