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