How To: Earn the "Sacrificial Lamb" achievement in Call of Duty: Black Ops Zombies

The only way to get the "Sacrificial Lamb" achievement in Call of Duty: Black Ops is to be playing in multiplayer mode in Black Ops Zombies. It could be done on any map in Black Ops Zombies, and you could probably guess what needs to happen to get this achievement on the Xbox 360. Somebody's got to die. Who will it be? You? Or the other guy?