Line ‘Em Up Trophy in OMG HD Zombies!
Line ‘Em Up
Shoot a Cop Zombie and have their bullet kill five other Zombies
How to unlock Line ‘Em Up
To do this you will likely need to get Cop Zombies to their maximum potential. Once you have done that, simply find a crowded level and start off by shooting a Cop Zombie. If the trophy doesn’t pop, restart the level and try again.