Well, on the last level, i had the "If you die you get another life" aceivement, but when i died, my HP just went to NAN, therefore i easily defeated the last 5 monsters...
Really, after you get artillery, the only unit you need is engineer, then you place a bunch of walls with mines inbetween them and fire your artillery shells as fast as you can.
 "Protector IV"){kind=icon}
 "Necronator"){kind=icon}
 "Take Something Literally 2"){kind=icon}
 "You are a..."){kind=icon}
 "Shadez: The Black Operations"){kind=icon}
 "YGOp: Yugioh Parody"){kind=icon}
 "Sift Heads"){kind=icon}
 "The Last Stand 2"){kind=icon}
 "The Final Death Wish"){kind=icon}
 "Modern Warfare 2 Quiz"){kind=icon}
 "Ultimate War"){kind=icon}
 "Zombie War"){kind=icon}
 "Super Mario Bros. Crossover"){kind=icon}
 "Field Command 3"){kind=icon}
 "Field Command 2"){kind=icon}
 "Field Command 1"){kind=icon}
 "Sydney Shark"){kind=icon}
 "Don't Shit Your Pants"){kind=icon}
 "zombie horde 3"){kind=icon}