I'm impressed that the zombies have a standard dreDress code? I'm surprised they even are polite enough to come in waves.ss code.For getting the achivement select "nightmare" difficulty, object collision, friendly fire and devils "off", select "Boxy" map, block one of the entries with "fake walls" and then kill everything with "rocket luncher". At the end of every level get everything zombies have left off, sure you'll recharge your rockets. Sur*makes a barrel wall, one barrel left till completion* Just one more. Game: Run out of Barrel, switching to pistol. *instant suicide explosion*e "win". Press "+" for keeping this comment "alive".ARE YOU NOT GETTING THE BADGE? well heres how to get it: get to a lvl around 48-52 instead of 42, build a few fake walls to where you are safe, and let the game sit for about 5 minutes, the registration for each level is slow so you have to give the system time to catch up. PLUS THIS COMMENT TO HELP OTHER PLAYERS!