Another achievement that is easily boosted in a private 1 vs. 1 Team Deathmatch. Have your friend spawn as a Lurker and meet at a open area (preferably a long hallway). This is about timing. The further away the Lurker is, the easier to react. Melee the lurker before it hits you with a pounce. The player controling the Lurker holds down and will see a trajectory of where they will pounce. Aim this at the person trying for the achievement and release when they're ready. May take a couple of tries. There's a few campaign locations for these, but perhaps the best is mission 4, at the very end. Before the final door is unlocked, you must kill 3 lurkers that spawn one at a time. Restart checkpoint if you can't get the timing for this achievement down before the 3rd one is killed.