Marvel: Ultimate Alliance

If you use cheats it will turn off achievements. And it's permanent to a certain extent. Just follow these steps to reverse the effect.

To fix the achievement lockout after entering cheats, do the following:

1. Erase all MUA saves.
2. Create a new gamertag.
3. Start a new MUA game with this new gamertag.
4. Once the game starts, join in with the gamertag that you used when you entered the cheats.
5. Play until you get to a save point, then save the game.
6. Restart your Xbox 360 and try to load the saved game with your regular gamertag (this won't work, but that's ok...just start a new game anyway).
7. This essentially creates a clean slate; you'll start to get achievements, but you'll need to unlock all of the characters and costumes again.

Now you should be able to gain achievements again.

--All credit for this find goes to theIllusionary1