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