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