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