So I ran into the same issue at first but was able to get my achievements working. The problem is that you cannot achieve achievements until you’ve made them public for your game. So after creating the achievements with your Steam Partner account, you have to hit the PUBLISH button and make them publicly available. This makes sense because you’re logging into the game via your own steam account and if they’re not available to the public then even you can’t see them. That’s why there’s a testing branch, to make sure your code is working. So use the 480 app id for your testing and then when you want to see your own achievements, make them public via the publish button on Steam.