It actually does come with achievements. The Wii version calls them "Accomplishments", and it's pretty much the same list for the XBOX Achievements. The only thing is that you're not gonna get "gamer points" or show off to your friends your "trophy list" cause it stays in game only.
But yes, it has in-game achievements --- Username: Andy1123 RB2:114607791660 CoD Reflex: 186603014038 GD:RB: 105157088173 If you add any of these please tell me so I add you!!