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