10,000
I picked up my (first) Xbox 360 back in April and recently passed a huge milestone. In just 7 months I managed to rake in over 10,000 Gamerscore points. I've never really been overly competitive or cared about scores and arbitrary numbers that really don't serve any purpose. But for whatever reason, the Gamerscore comprised of unlocked Achievements, has had me by the balls from day one.