I just cannot seem to get this achivement, are there any tricks or hints that anyone knows of. Thanks
the way I achieved this one is this-We were playing on Der Riese using the catwalk strategy waited until there was a insta- kill skull that appeared(mainly because we were onna high round) it makes it easier to get the kills also with insta kill present. One player throws a monkey bomb out the window of the catwalk making the monkey bomb go out of bounds - like over the fence by the power switch ( do this so the monkey bomb wont kill all the zombies) then while all the zombies are gathered together grab insta kill have your partner jump off the catwalk shoot him with up-graded crossbow and run into the swarm and tada sacrifical lamb! This took us alot of trys but worked
And if you still struggle mate type in sacrifical lamb in youtube and there you will find loads of vids showing different ways of achieveing it.Its pretty easy to get just getting the damm crossbow out the box is a pain.
