Originally Posted by Capn Doug
Common glitches like that (which can be completely unintentional) will not necessarily get you reset, though they might get you on a watchlist. MS enforcement knows about glitches like that. Despite some people's protestations, one achievement does not spell doom for your gamerscore. There is a threshold of evidence required for a reset, which is actually above a single online achievement unlocked offline (since there are other ways to get that appearence).
So if i were to get that game and pop 800g in the space of 30 seconds offline then it would be perfectly fine? I Love little glitches like these but when it involves getting online ones offline it kinda worries me.