Google Play Games achievement unlocked popup not showing

Question

I\'m unlocking achievement using this simple method from developers docs:

Games.Achievements.unlock(getApiClient(), \"my_achievement_id\");

Answer 1

Had the same problem. I have solved it by adding icon to the achievement. I am not kidding, it is really strange but it started to work after that. Please note that I am talking about not published project, I was just testing my app and wondering what is going on.