$Mr. Taylor if you're nasty!
I used to think I wanted a ton of achievements and a ridiculously high gamerscore. Now, I know I played all these games to keep from being bored. Achievements are the perfect incentive to keep me going further. Before my 360, I would usually play games halfway through before moving onto something else. Sometimes not even that far. Achievements and ocd made me a completionist. 63 games and counting since August 2008!