so you can use cheats in single player and still get the achievements? I'm playing on hard and at the last two missions but my file glitched so I can't progress so I'm gunna restart and use cheats cuz I cant be bothered to use effort and fight my way back to that point in the game

Most achievements for games get locked if you cheat. Usually when you do cheat, it will tell you that if you save then you won't be able to obtain achievements. Maybe try installing the game to the hard drive and trying again, that might pass the glitched part of the level and allow you to complete it without starting again.

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I cheated and still got the achievements but newer games lock achievements when you cheat