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