I think I've a clue! It seems that my fix works only on local test, but not for people downloading the game from the store, it may have a probleme where the store version is using the test api and the local api is using the store api (Don't know if i'm clear).
So i think, the test api should pop achievements but not register them, and the release api should register the achievements, and Something might be wrong in the achievements config and everything is working on the wrong way (but Why not for everyone, i Don't know).
Ok, i can confirm that people using my app from the store can't unlock achievements but with local apk it works. Don't know what to do to fix that, google api are really confusing to me