Here is the full list of all 45 Paranautical Activity: Deluxe Atonement Edition achievements.
Complete a hole floor without falling in.
Complete a floor without jumping.
Spend all your money gambling.
Fall into a hole in a hole floor.
Complete a room without attacking.
Get a ghost and survive the floor.
Complete a floor without taking damage.
Beat any mode with Tank.
Beat classic mode.
Kill Dahlia.
Let a boss die to poison.
Beat the sixth floor.
Have 1000 coin dollars.
Survive a dark floor.
Kill 100 Gileads.
Beat the fourth floor.
Beat the second floor.
Have more armor than health.
Run out of superweapon ammo.
Kill a Tenchi while it's invisible.
Complete a room without taking damage.
Have 69 bombs.
Have 30 items at once.
Beat any mode in under 15 minutes.
Kill 1000 Jimbaabwehs.
Figure out how to get to the 8th floor.
Beat hardcore mode.
Beat any mode with Gilead
Beat any mode with Bouncer
Beat any mode with Gorton
Beat any mode with David Bowie
Beat any mode with Dynomite.
Beat any mode without taking items.
Beat Hardcore Mode with all 6 characters.
Beat hardcore mode 10 times.
Beat 4 floors in a row using only melee attacks.
Beat hardcore mode without spending money.
Beat hardcore mode having gone into every room.
Spawn two ghosts at once.
Kill Dahlia after she spawns every set of enemies. Twice.
Kill Dahlia without taking damage.
Kill every boss.
Get every item.
Use every weapon.
Get every achievement.