diff --git a/src/js/game/achievement_proxy.js b/src/js/game/achievement_proxy.js
index 9077b283..abc7bb62 100644
--- a/src/js/game/achievement_proxy.js
+++ b/src/js/game/achievement_proxy.js
@@ -52,7 +52,7 @@ export class AchievementProxy {
     }
 
     initialize() {
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.darkMode, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.darkMode);
 
         if (this.has(ACHIEVEMENTS.mam)) {
             this.root.signals.entityAdded.add(this.onMamFailure, this);
@@ -142,7 +142,7 @@ export class AchievementProxy {
             this.root.signals.entityDestroyed.add(this.onMamFailure, this);
         }
 
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.mam, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.mam);
 
         // reset on every level
         this.root.savegame.currentData.stats.failedMam = false;
diff --git a/src/js/game/root.js b/src/js/game/root.js
index 64004e9d..e0c8972b 100644
--- a/src/js/game/root.js
+++ b/src/js/game/root.js
@@ -187,7 +187,7 @@ export class GameRoot {
             freeEntityAreaBeforeBuild: /** @type {TypedSignal<[Entity]>} */ (new Signal()),
 
             // Called with an achievement key and necessary args to validate it can be unlocked.
-            achievementCheck: /** @type {TypedSignal<[string, any]>} */ (new Signal()),
+            achievementCheck: /** @type {TypedSignal<[string, ...(any)[]]>} */ (new Signal()),
             bulkAchievementCheck: /** @type {TypedSignal<(string|any)[]>} */ (new Signal()),
 
             // Puzzle mode
diff --git a/src/js/game/shape_definition_manager.js b/src/js/game/shape_definition_manager.js
index 89203f1e..92fc9538 100644
--- a/src/js/game/shape_definition_manager.js
+++ b/src/js/game/shape_definition_manager.js
@@ -97,7 +97,7 @@ export class ShapeDefinitionManager extends BasicSerializableObject {
         const rightSide = definition.cloneFilteredByQuadrants([2, 3]);
         const leftSide = definition.cloneFilteredByQuadrants([0, 1]);
 
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.cutShape, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.cutShape);
 
         return /** @type {[ShapeDefinition, ShapeDefinition]} */ (this.operationCache[key] = [
             this.registerOrReturnHandle(rightSide),
@@ -140,7 +140,7 @@ export class ShapeDefinitionManager extends BasicSerializableObject {
 
         const rotated = definition.cloneRotateCW();
 
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.rotateShape, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.rotateShape);
 
         return /** @type {ShapeDefinition} */ (this.operationCache[key] = this.registerOrReturnHandle(
             rotated
@@ -195,7 +195,7 @@ export class ShapeDefinitionManager extends BasicSerializableObject {
             return /** @type {ShapeDefinition} */ (this.operationCache[key]);
         }
 
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.stackShape, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.stackShape);
 
         const stacked = lowerDefinition.cloneAndStackWith(upperDefinition);
         return /** @type {ShapeDefinition} */ (this.operationCache[key] = this.registerOrReturnHandle(
@@ -215,7 +215,7 @@ export class ShapeDefinitionManager extends BasicSerializableObject {
             return /** @type {ShapeDefinition} */ (this.operationCache[key]);
         }
 
-        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.paintShape, null);
+        this.root.signals.achievementCheck.dispatch(ACHIEVEMENTS.paintShape);
 
         const colorized = definition.cloneAndPaintWith(color);
         return /** @type {ShapeDefinition} */ (this.operationCache[key] = this.registerOrReturnHandle(
diff --git a/src/js/platform/achievement_provider.js b/src/js/platform/achievement_provider.js
index 3b60ad95..d236ad1d 100644
--- a/src/js/platform/achievement_provider.js
+++ b/src/js/platform/achievement_provider.js
@@ -328,7 +328,7 @@ export class AchievementCollection {
      * @param {string} key - Maps to an Achievement
      * @param {any} data - Data received from signal dispatches for validation
      */
-    unlock(key, data) {
+    unlock(key, data = null) {
         if (!this.map.has(key)) {
             return;
         }
@@ -597,7 +597,7 @@ export class AchievementCollection {
 
     /** @param {Achievement} achievement */
     initStore100Unique({ key }) {
-        this.unlock(key, null);
+        this.unlock(key);
     }
 
     /** @returns {boolean} */
@@ -607,7 +607,7 @@ export class AchievementCollection {
 
     /** @param {Achievement} achievement */
     initStoreShape({ key }) {
-        this.unlock(key, null);
+        this.unlock(key);
     }
 
     /** @returns {boolean} */