Here is the full list of all 10 Night At the Gates of Hell achievements.
Defeat the Cheek Freak
Defeat Dr. Fleshenstein
Survive the Last Stand
Survive the Facility's Experiment
Defeat the Shark
Kill 50 Zombies with headshots
Kill 25 Zombies with headshots
Complete the Woodside Apartment Level
Use 5 Knives
Kill 10 Zombies with headshots