I think the achievements that you get when you kill so many mobs should unlock as titles you can use on your character (Zombie-Killer Earl, for instance).
And there should be more achievements for things like dieing a lot (Dead Meat, Roadkill, etc) and killing a lot of specific mobs (Yeti Threat, Knight Knocker) and getting a lot of gold (Thief, Sultan).
Just an idea :D
