This achievement is a little miss leading.Requirements
You are required to kill 20 lying zombies before they get up.
However, you can kill zombies not just lying down they can be sat on floor or slouched over an object They must be killed with a silenced pistol/weapon Headshot to register or it will not count
. Valid Zombies
To identify the zombies you can kill before they are disturbed, your reticle will go from white to red on the zombies that can be killed as shown in below images: Locations
They can be found on most Chapters, here are just a few:Episode 1:
New York - Chapter 1: Descent They can be found throughout this map in corridors and rooms, just before the lift section and opposite the lift exit area
Jerusalem - Chapter 2: Dead Sea Stroll Once you spawn in move to the left they can be found in the water and just before the metal set of stairs
As soon as you headshot with a silenced pistol (or alternative weapon if progression permits) your percentage bar will go up by 5% so keep an eye on it.
As soon as your 20th kill, Pop achievement unlocked in game!
Happy Hunting*Thanks once again to mga74 with assistance to confirm that body kills don’t register for some reason and headshots do as you wake and disturb them.*
**Positive FB welcome if you feel the need to negative vote please state why so I can amend the guide thank you**