Here is the full list of all 13 Deadly Escape achievements.
Kill 20 Undead with the Rifle
Use 5 Medkits
Kill the First Boss
Find the Rifle
See the Game Over screen for the first time
Power up the generator
Kill 10 Undead with explosive barrels
Kill 30 Undead
Kill 10 Undead with the Shotgun
Kill 20 Undead
Kill 10 Undead with the Handgun
Kill 10 Undead
Kill the first Undead