Here is the full list of all 88 Power Fantasy achievements.
Survive 5 minutes with Aric.
Survive 10 minutes with Ember.
Defeat the Slime Cube.
Defeat the Skeleton King.
Defeat the Ghoulish Giant.
Defeat the Angel of Death.
Defeat all bosses in one run.
Defeat the Risen Minotaur.
Upgrade 10 perks.
Slay 100 enemies without leveling up.
Survive 10 minutes without taking any damage.
Get killed by a Mimic.
Slay 100 bosses.
Equip 5 items at once.
Leave 20 items on the ground
Defeat all bosses in one run. (Nightmare 5 difficulty)
Discover a perk synergy.
Defeat all bosses in one run without taking any damage.
Defeat all bosses in one run without taking any damage. (Nightmare 5 difficulty)
Reach level 10.
As Misty, use your broom at least 5 times in one game.
Reach level 15.
Reach level 20.
Reach level 25.
Reach level 30.
Survive 15 minutes with Aric (Normal difficulty)
Survive 15 minutes with Aric (Nightmare 5 difficulty)
Survive 15 minutes with Ember (Normal difficulty)
Survive 15 minutes with Ember (Nightmare 5 difficulty)
Survive 15 minutes with Icicle (Normal difficulty)
Survive 15 minutes with Icicle (Nightmare 5 difficulty)
Survive 15 minutes with Kaito (Normal difficulty)
Survive 15 minutes with Kaito (Nightmare 5 difficulty)
Survive 15 minutes with Misty (Normal difficulty)
Survive 15 minutes with Misty (Nightmare 5 difficulty)
Slay 10.000 enemies.
Survive 15 minutes with Zikk (Normal difficulty)
Survive 15 minutes with Zikk (Nightmare 5 difficulty)
Survive Nightmare 1 with one hero.
Survive Nightmare 2 with two heroes.
Survive Nightmare 3 with three heroes.
Survive Nightmare 4 with four heroes.
Survive Nightmare 5 with five heroes.
As Ember, survive a run with 5 ice perks.
As Icicle, survive a run with 5 fire perks.
Survive your first challenge.
Touch your first bufferfly.
Survive with at least 4 physical and 4 arcane perks.
Touch 10 bufferflies in one run.
Beat the challenge Mirrored Gargoyle.
Beat the challenge The Void.
Obtain 10 unlockables.
Survive Nightmare 5 without attacking once.
Survive Krampus Night (Normal difficulty)
Complete all Nightmare 5 challenges in one run.
Get Whisper of Death after acquiring all five books.
Defeat the Angel of Death without any projectile damage modifiers. (Nightmare 3+)
Reach level 40 with one projectile.
Slay 25.000 enemies during one run in Dark Abyss.
Survive Krampus Night (Nightmare 5 difficulty)
Survive 15 minutes with Daria (Normal difficulty)
Survive 15 minutes with Gundel (Normal difficulty)
Survive 15 minutes with Daria (Nightmare 5 difficulty)
Survive Hell for 10 minutes.
Die by the Hell-o-Meter reaching its maximum.
Reach Hell-level 50.
Survive 15 minutes with Gundel (Nightmare 5 difficulty)
Die with at least 10 remaining rerolls.
Survive 15 minutes with Effy (Normal difficulty)
Defeat the Grim Reaper.
Survive with Kaze (Normal difficulty)
Survive with Kaze (Nightmare 5 difficulty)
Defeat Krampus.
(DLC) In Krampus Night, destroy an evil snowman during the challenge Snowball Fight.
Reach level 35.
Reach level 40.
Survive 15 minutes with Effy (Nightmare 5 difficulty)
Reach level 25 with Santa.
Slay 100.000 enemies.
Beat the challenge Snowball Fight.
Slay 1.000.000 enemies.
Survive 3 minutes without attacking once.
Touch a total of 300 bufferflies.
Beat the challenge Armored Warrior.
Beat the challenge Apocalyptic Riders.
Survive a run with at least 420 unspent coins.
Have 5 companions at once.
Spend a total of 1000 coins at the Undead Merchant.