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