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