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