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