i used cheats and saved it many of times and still got the achievments afterwards. If you use cheats and save the game, the cheats you used wont be active when you log back in but will be saved on your cellphone, cheats such as the health cheat, when used a message appears, sating Those achievments are disabled, even if u save it turn off your 360 and load it back up, you will be able to get achievments, well i was able to