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