|Description||Shoot at or be shot by an ally with a Pack-a-Punch crossbow and kill six zombies with the explosion.|
The aim of this achievement/trophy is to kill 6 zombies either by sticking a teammate with a bolt from the Pack-a-Punch Crossbow, the Awful Lawton, or to get stuck by said crossbow and get six kills as a result. Because of the fact that weapon upgrades are costly, and the fact that high-level zombies will not be felled by the Crossbow, this is a difficult achievement.
The Crossbow can be obtained on any zombie level (except Moon), but only from the Mystery Box. Because of the random nature of the Box, players may not see the Crossbow at all. However, obtaining the weapon is only the first step. The criteria of the achievement states that an upgraded Crossbow must be used. If a player wishes to obtain this achievement, a significant sum of points must be put aside to purchase the upgrade. If the players survive long enough to upgrade the weapon, then attention must be focused on killing the requisite amount of zombies. Ideal locations to get the achievement are wide open areas, such as the stage in Kino der Toten, or in the vicinity of Lunar Lander Д in Ascension. When a significant amount of zombies clump together, it is the best time to fire. After a player is stuck, the best course of action is to run into the zombie horde, attempting to kill as many as possible. (Juggernog is advised for this approach). Another possible technique is to have one player throw a Monkey Bomb. Then have another player run into the middle of the group of zombies that gather. Before the Monkey bomb explodes, have the player in the middle of the group shoot with the crossbow. If done at the right time the crossbow bolt should explode before the Monkey Bomb, giving the achievement/trophy. Another easy way to achieve this trophy on the higher rounds, is by making 6-8 crawlers. Have one player shoot the "lamb" then have him run into the middle.