Here is the full list of all 37 Have a Nice Death achievements.
Defeat a Thanager.
Unlock your first item at Joe’s.
Reach the maximum discount level on an item at Joe’s.
Buy your first item from Muriel.
Die once.
Visit the break room.
Defeat a game boss for the first time.
Gain a curse.
Finish the game.
Waste Time.
Complete a run on maximum difficulty.
Unlock all the items at Joe’s.
Unlock all the curses in the encyclopedia.
Unlock all the descriptions in the Employee Handbook.
Defeat Ms. Catherine Imamura.
Defeat Major Pliskhan.
Defeat all the Thanagers.
Reach Level 20 with your experience.
Complete a run with a difficulty level.
Unlock all the scythes.
Unlock all the Cloak’s weapons.
Unlock all spells.
Reach the maximum upgrade level for a weapon.
Transform a scythe to the maximum level.
Defeat Barnaby Proudfoot.
Visit the relaxation room.
Play in easy mode.
See all Patrick’s dialogs during the guided tour.
Max out the soul counter.
Finish the Halloween narrative quest.
Speak to Pump Quinn (very) often.
Finish the rumor narrative quest.
Finish the April Ghouls narrative quest.
Finish the Christmas narrative quest.
Finish the strike narrative quest.
Finish the koffee competition narrative quest.
Equip a different scythe.