MMO achievement systems are basically just there to allow us to relive our childhoods in the Cub Scouts, or as in my case, the Girl Guides.
Oh look I tried the Cubs, but their faction rewards sucked, and they had a horrible tabard.
Back in the land of MMOs:
“Oooo, I got the ‘Killed 100 Beastmen’ badge, I’ll sew that one on to my armour tonight!”
“Well I’ve got an epic woggle!”
“Oh, I thought you were just walking funny.”