I have a profile with a decent amount of gamerscore on it that is all legit every single achievement was done legit and all. The thing is it does not look very legit.. My xbox 360 glitched and never unlocked the Fallout 3 achievements that I received earlier in the game so it almost looks out of order with a few of the main quest missing. It shows the quest complete that unlocks the achievement in the game but the achievement is still locked on my gamer tag. Also on Left 4 Dead my Xbox 360 froze on the last part of "Dead Air" so the achievement never pop'd which I did not notice until I restarted my xbox and did the next chapter. I mean i'd hate to be mistaken as a game saver and have MS reset my butt yet there is nothing much I can do. If I were to call MS and tell them that the game glitched and didn't give me my cheevos they would just laugh histraically!