In response of an error from this link...
ACHIEVEMENTS ARE LOCKED FROM BEING UNLOCKED UNTIL THE BUG IS FIXED!
Worry not, if you have achieved the achievement, it won't get erased or anything. It's just, when you supposed to be achieving a new one, it won't register.
We will notify immediately when the crash-inducing bug is fixed. We're very sorry for the inconvenience, and thank you for understanding...