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