Delete the game and you get all that space back, and more. However, to replay it you will need to install it again.SamElliot said:They got it right. The only thing I like about Achievements is that sometimes they're cleverly named (see Press X for Jason), but otherwise it's just dumb, and I'd rather have the option to turn them off, or not even have them (especially since they take up space on my PS3's hard drive).
OT: The only thing I enjoy about the achievements are the names of some of them. Like the ones on TF2, they are hilarious. Besides that, I am going to agree with the sentiment of an achievement for every level or major checkpoint completed is patting you on the head for remembering to lift the lid on the toilet before using it.