Nintendo Achievement awards

[Marth]

As far as unlock-able items go with achievements these days, the 360 does do this on occassion. For example if you get the gnome achievement in Left 4 Dead 2 you get an avatar award. Halo Reach also does this, if you clear certain tasks you unlock the characters' helmets for your avatar.

Again these don't really "do" anything but at least it's something I guess.