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