diff --git a/resources/lang/en.json b/resources/lang/en.json
index 6433ace69..cb0880682 100644
--- a/resources/lang/en.json
+++ b/resources/lang/en.json
@@ -244,6 +244,8 @@
     "personal_player_id": "Personal Player ID:"
   },
   "achievements": {
+    "test": "Test",
+    "test_desc": "This is a test achievement.",
     "win_no_nukes": "Win Without Nukes",
     "win_no_nukes_desc": "Win a free-for-all match without launching any nukes."
   },
diff --git a/resources/playerAchievementMetadata.json b/resources/playerAchievementMetadata.json
index 30c275e3d..38da16ae8 100644
--- a/resources/playerAchievementMetadata.json
+++ b/resources/playerAchievementMetadata.json
@@ -1,4 +1,7 @@
 {
+  "test": {
+    "difficulty": "Medium"
+  },
   "win_no_nukes": {
     "difficulty": "Hard"
   }
diff --git a/src/client/components/baseComponents/stats/PlayerAchievements.ts b/src/client/components/baseComponents/stats/PlayerAchievements.ts
index c7710c3ae..5663dc54f 100644
--- a/src/client/components/baseComponents/stats/PlayerAchievements.ts
+++ b/src/client/components/baseComponents/stats/PlayerAchievements.ts
@@ -22,6 +22,13 @@ const playerAchievementMetadata = playerAchievementMetadataJson as Record<
   string,
   PlayerAchievementMetadata
 >;
+const MOCK_UNLOCKED_TEST_ACHIEVEMENT = {
+  playerId: "0",
+  achievement: "test",
+  achievedAt: "2025-01-01T00:00:00.000Z",
+  gameId: "0",
+  game: "ui-test",
+} satisfies PlayerAchievementJson;
 
 @customElement("player-achievements")
 export class PlayerAchievements extends LitElement {
@@ -32,13 +39,24 @@ export class PlayerAchievements extends LitElement {
   @property({ attribute: false }) achievementGroups: AchievementsResponse = [];
 
   private get unlockedAchievements(): PlayerAchievementJson[] {
-    return this.achievementGroups
+    const unlockedAchievements = this.achievementGroups
       .flatMap((group) => (group.type === "player" ? group.data : []))
-      .slice()
-      .sort(
-        (a, b) =>
-          new Date(b.achievedAt).getTime() - new Date(a.achievedAt).getTime(),
-      );
+      .slice();
+
+    if (
+      !unlockedAchievements.some(
+        (achievement) =>
+          achievement.achievement ===
+          MOCK_UNLOCKED_TEST_ACHIEVEMENT.achievement,
+      )
+    ) {
+      unlockedAchievements.push(MOCK_UNLOCKED_TEST_ACHIEVEMENT);
+    }
+
+    return unlockedAchievements.sort(
+      (a, b) =>
+        new Date(b.achievedAt).getTime() - new Date(a.achievedAt).getTime(),
+    );
   }
 
   private get achievements(): PlayerAchievementCard[] {