Microsoft has said the issues causing Gamerscores and Achievements to be reset to zero has now been resolved.
Earlier this morning, gamers started reporting that achievements and Gamerscores had been resetting to zero should new achievements be unlocked, however Microsoft has now issued a statement to confirm the problem has been resolved.
“The issue that some customers were experiencing with zero Achievements and Gamerscores has now been resolved. We apologize for any inconvenience this may have caused. You may need to log off and log back in for the information to be updated.”