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