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