Here is the full list of all 45 Paranautical Activity: Deluxe Atonement Edition achievements.
Beat any mode with Gorton
Beat hardcore mode having gone into every room.
Kill Dahlia after she spawns every set of enemies. Twice.
Use every weapon.
Beat 4 floors in a row using only melee attacks.
Spawn two ghosts at once.
Complete a hole floor without falling in.
Beat any mode with Bouncer
Beat hardcore mode.
Beat any mode with Tank.
Beat any mode with Gilead
Kill every boss.
Kill Dahlia without taking damage.
Figure out how to get to the 8th floor.
Kill 1000 Jimbaabwehs.
Spend all your money gambling.
Get a ghost and survive the floor.
Beat any mode with David Bowie
Have 69 bombs.
Complete a floor without taking damage.
Beat any mode with Dynomite.
Beat classic mode.
Have 30 items at once.
Kill Dahlia.
Beat the sixth floor.
Survive a dark floor.
Have 1000 coin dollars.
Beat the fourth floor.
Fall into a hole in a hole floor.
Complete a room without attacking.
Kill 100 Gileads.
Complete a floor without jumping.
Run out of superweapon ammo.
Let a boss die to poison.
Complete a room without taking damage.
Have more armor than health.
Kill a Tenchi while it's invisible.
Beat the second floor.
Beat any mode in under 15 minutes.
Beat any mode without taking items.
Beat Hardcore Mode with all 6 characters.
Beat hardcore mode 10 times.
Beat hardcore mode without spending money.
Get every item.
Get every achievement.