Unlike other useless achievements, The Zombie Genocider achievement (kill 53'594 zombies) unlocks Rockman's Mega Buster in the security office. Once this achievement is accomplised, let your current mode run down (72 Hour Mode is best). Once the credits roll, the unlockable will appear and you can save it to your gamertag profile. Frank can stock the weapon, but can only carry one at a time.







Submitted by thekmillion
Verified by faididi, simalcrum, sng-ign