Don't get me wrong though, I still play games to complete or for fun, I brought 'Splosion man for the xbox this week, and its a BRILLIANT game, so much fun its crazy, never before have I laughed so much playing a game, its great.
I do like completing games, but I find the addition of achievements drives me to get the full value out of a game, take Resident Evil 5, great game, I love it, however, without the achievements I doubt I would have done the 3 (very enjoyable) playthroughs I did.