For this trophy, it's just a matter of RNG in New york city- Pt 3 (hell and high water). I recommend doing this with a friend to help save time and ammo; the best thing to do is kill your AI teammates in a private session, then when you go down the stairs, look along the road to the left, if you see a barrel and oil trail go for it and shoot an unsilenced gun this alerts a small hord and will draw them to you, after getting a quick and small hord, IMMEDIATELY SHOOT THE OIL, then run through it and make circles around making sure to train the small hord of Zombies through and then the fire burns out the trophy will pop.