Just wanted everyone to know that after you beat the game on any difficulty - I chose Easiest to make it easier - just choose chapter select and replay level 8 on Uber and you will get this trophy. Chapter 8 isn't so bad. Just sneak around the levels, headshot the zombies in the penultimate area and survive the final battle and you're a shoe-in.
This will also unlock:
Unlocked on 04/12/16. I can't see this ever getting patched.