After extracting the farmer's brain, kill the farmhands without taking any damage or using the Zap-O-Matic during the mission "Destination Earth!" in Turnipseed Farm.
After destroying all human dwellings, annihilate the entire military threat without using the Death Ray during the mission "Destination Earth!" in Turnipseed Farm.
After enjoying the movie, defend the projector without taking any damage or letting the projector be hit during the mission "Teenage Zombies from Outer Space" in Rockwell.