Unlock achievement in Google Play Service

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http://stackoverflow.com – I have set up a few achievements and they work pretty well. I am able to increment it, to unlock it, but I can't see the fancy notification when it's unlocked: I am using the BaseGameActivity to unlock achievements. Games.Achievements.unlock(getApiClient(), getString(R.string.achievement_1)); Bun when I unlock it, no notification appears. The question is: how to make the notification appear? (HowTos)