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