Nothing, it shows your progress on the Xbox 360 and it gives you competition veruses other gamers the higher gamerscore you have the more reputition you have with other gamers.
No you cant get achievements for the original xbox games, sorry.
No you can't.
Over 50 Achievements.
no
yes
avatar
You can only delete achievements that have "0" on their Gamerscore.
I guess they are in a sense something to challenge you.
No
no its common sence
The Xbox 360 does not recognize achievements nor have achievements for halo 2 for the xbox, halo 2 for the PC is different. Halo 2 on the PC has achievements and you CAN see them from your xbox if your searching his achievements. sorry
I have the exact same issue I think. I can only see my achievements when I browse the xbox 360. I don't see when I get an achievement.