^^^ like he said.
In Geometry Wars 1 and 2 say, the achievements add so much to the game. Goals you wouldnt do normally.
Same with gears of war 1 and 2 or Fable 2, or even dead rising.
After you beat a game, they keep you coming back for more.
And the tough ones, like some in left for dead, are a badge of honour to some.








