diff --git a/functions/src/create-user.ts b/functions/src/create-user.ts
index c3b7ba1d..d22b8a2e 100644
--- a/functions/src/create-user.ts
+++ b/functions/src/create-user.ts
@@ -70,6 +70,7 @@ export const createuser = newEndpoint(opts, async (req, auth) => {
     followedCategories: DEFAULT_CATEGORIES,
     shouldShowWelcome: true,
     fractionResolvedCorrectly: 1,
+    achievements: {},
   }
 
   await firestore.collection('users').doc(auth.uid).create(user)