Here is the full list of all 45 Paranautical Activity: Deluxe Atonement Edition achievements.
Complete a room without attacking.
Get a ghost and survive the floor.
Beat any mode with Gorton
Beat classic mode.
Kill Dahlia.
Have 1000 coin dollars.
Beat the sixth floor.
Complete a floor without taking damage.
Complete a floor without jumping.
Kill 100 Gileads.
Beat the fourth floor.
Survive a dark floor.
Beat the second floor.
Kill a Tenchi while it's invisible.
Fall into a hole in a hole floor.
Run out of superweapon ammo.
Let a boss die to poison.
Have more armor than health.
Complete a room without taking damage.
Complete a hole floor without falling in.
Have 69 bombs.
Have 30 items at once.
Beat any mode in under 15 minutes.
Spend all your money gambling.
Kill 1000 Jimbaabwehs.
Figure out how to get to the 8th floor.
Beat hardcore mode.
Beat any mode with Tank.
Beat any mode with Gilead
Beat any mode with Bouncer
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.