I used to try for 100% on games on my Sega Genesis and PS2, but now, games are so big, it's incredibly difficult to get even close to 100%. My xbox claims that I have 100% completion of Oblivion, but that's a total lie. I have all the achievements, but I have not done everything in that game, there's no way. It came out FIVE years ago, and I'm probably still not even close to 100%. (Not that I've been playing it five years straight, but I pick it up every once in awhile)