Gamerscore, achievements, etc

[Arjahn]

I enjoy some of the really difficult ones, especially if you get a cool reward for getting them that let's you show off to people that you've done something a lot of them haven't.
For a crappy example, I don't care much for COD and I don't feel like I need to bring up any of the over abundant issues with it, but It can still be fun to just hop online and play, and I just so happened to find a copy of the Wii version of MW3 on the street (seriously... that happened), and now I'm one of relatively few players on the version to have unlocked the "Loner" achievement (which is a bitch to get by the way), which just so happens to give you a Mario icon. That sort of thing feels good, not like a lot of others where it says "Oh, you beat 3 pigs up, ACHIEVEMENT GET BLARGH!"