This achievement is for completing all 10 single player levels in the game.
Most levels require you to find the 3 guitar parts and then play the song to clear the level, but there are a few in which you need to kill a required amount of zombies and activate the machine to progress.
This achivement can bee done on easy and isn't very hard to obtain. If playing on harder difficulties, make sure you don't get any of your characters trapped and killed, and pay attention to where the zombies are coming from.