I have an Android game and I'd like to play a sound whenever a players unlocks an achievement, but I can't seem to find a way to know when the user unlocks the achievement, since most of my achievements are incremental I have no way to code it on the client side, the only way would be some callback called when the Google API shows the achievement box, but I can't find any of those on the documentation... Only thing i found was this: Integrating Google Play services achievements and android notifications
@Override
public void onAchievementUnlocked(final String id)
{
//
}
but I have no idea how to implement that or how to call that method and I had no luck on Google