Full list of all 101 Skul: The Hero Slayer achievements.
The base game contains 57 achievements, and there are 5 DLC packs containing 44 achievements.
Defeat St. Joan II without getting hit
Defeat the First Hero without saving the stage NPC
Defeat Chimaera without getting hit
Defeat the Leiana Sisters without getting hit
Restore the Demon King Castle to its original form
Acquire Nightmare
Defeat the First Hero as Little Bone
Acquire Desperado
Acquire Magnifico
Keep restocking from the collector
Acquire Soul Knight
Acquire Sniper
Keep talking to Headless
Acquire Poseidon
Acquire Dark Avenger
Acquire Warlord
Acquire Joker
Acquire Demolitions Expert
Acquire Elder Ent Skull
Acquire Eternal Mummy
Acquire Ghoooooul
Acquire Gold Gargoyle
Acquire Devil Berserker
Acquire Destroyer
Acquire Minotaurus III
Acquire Defender Captain
Acquire Vanguard Captain
Acquire Royal Guard Captain
Play on Rookie Mode
Reach the top of the chandelier in the Demon King Castle
Reach the top of the throne in the Demon King Castle
Rescue the Demon King and return to the Demon King Castle
Defeat the Sword of Carleon, the First Hero
Acquire Neo Samurai
Acquire Eternal Werewolf
Acquire Carleon Commander
Acquire Super Rock Star
Defeat the archbishop of the Leonia Order, St. Joan II
Acquire Master Ninja
Acquire Abyssal Monarch
Acquire Frozen Spirit
Defeat the distorted goddess, Chimaera
Kill 100 adventurers
Defeat Yggdrasil without getting hit
Acquire Dark Alchemist
Acquire Gambler
Acquire Champion
Acquire Yaksha
Defeat the adjutants of the Gold Mane Knights, the Leiana Sisters
Acquire Arch Lich
Acquire Grim Reaper
Defeat the elder ent, Yggdrasil
Stay in the black market for 5 minutes
Stay in the black market for 1 minute
Die from a trap
Return after experiencing death
Defeat the First Hero without getting hit