Here is the full list of all 24 DEADBOLT achievements.
Buy a weapon from Charon.
Clear a stage with only headshot kills.
Clear the first mission.
Earn every achievement.
Beat the entire game within 1 hour without quitting.
Beat the entire game without dying or quitting.
Get a five star rating on all missions.
Kill an undead... using the toilet.
Collect all memory tapes.
Clear a stage with only melee weapons.
Kill Puff without using the Tommy Gun.
Melee a bouncer to death.
Clear "The Bogeyman" without being seen.
Clear all Zombie Kingz missions.
Kill a vampire mid-air.
Clear "The Bloody Mary" without letting any vampires revive.
Kill Amber with a melee weapon, and Evelyn with a ranged weapon.
Clear all 1000 Year Royals missions.
Kill a Sergeant mid-spin.
Destroy a body as it's being revived.
Clear "Timur the Tinkerer" using only trap kills.
Clear all Dredged missions.
Clear Vall's sniper nest using only headshots.
Clear "Ibzan" without being seen once.