i was playing Black ops 2 and a modder gave me and other members achievements we didn't earn and ruined the overall match.
Nothing anyone can do.
Individual achievements can't be removed.
Chances are you will receive a Gamerscore reset which will remove all of your xbox 360 games achievements & you will not be able to re earn any reset achievements on that account again.
As long as you reported this "modder" via your console they will be investigated.
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