The Map Pack 3 Add-on for Call of Duty: World at War has 10 achievements worth 250 gamerscore.
Use the Monkey Bomb. (Map Pack 3 only)
Kill 40 zombies with the bowie knife. (Map Pack 3 only)
Upgrade 5 weapons at the Pack a Punch Machine. (Map Pack 3 only)
Upgrade any weapon in Pack A Punch. (Map Pack 3 only)
Activate the Fly Trap. (Map Pack 3 only)
Link all teleport pads before round 7. (Map Pack 3 only)
Use the teleporter 8 times. (Map Pack 3 only)
Open all doors in the map. (Map Pack 3 only)
Obtain the Ray Gun, DG-2, and Monkey Bomb at the same time. (Map Pack 3 only)
Survive until round 20 without buying a single Perk. (Map Pack 3 only)