As you know, we are committed to keeping Xbox LIVE a safe and fair place to play for the more than 17 million active members. As part of our regular safety monitoring we have pinpointed a group of players who have unlocked specific Gears of War 2 Achievements through an unauthorized hack. Deliberate cheats like these are in direct violation of the Xbox LIVE Terms of Use and will not be tolerated. As I post this, we've begun taking steps to reset the Gamerscores of the offending players. As I have mentioned in the past, this is something we do occasionally to keep the service free of cheating in order to maintain a fair and level playing field for everyone. If you play fair and earn your achievements without glitching or cheating, you have nothing to worry about. Read my original post that shows what a cheater looks like and head over to Xbox.com to read the Gamerscore correction FAQ that may answer some of your questions.