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