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KylieDog said:

The Black Ops zombies trophies are quite tough and require a lot of luck.  Such as finding a ballistic knife in the random weapon box, then upgrading it as a cost of 5k, then needing save a downed teamate with it.  I've never got a ballistic knife turn up.

 

Same issue with the explosive bolt zombie trophy, same deal with never seeing one let alone the rest of the requirement.


Tried it for 2-3 hours but never get the Ballistic knife or Crossbow.

U got the Collector trophy? that one is pain aswell.