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