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