Here is the full list of all 42 Skelly Selest achievements.
Purge the soul of a malicious Arch Lichemancer!
Purge the soul of a malicious Arch Lichemancer with a score of 5555+
Collect at least 25% of the entire card collection from the bones of evil souls!
Collect at least 25% of the hat fashion line from the bones of evil souls!
Aquire the wisdom of the tutorial!
Complete the entire card collection!
Win a game of Clashful Cards!
Attain 12+ game wins in Clashful Cards!
Purge the soul of a sinful Deamonica Netherlord!
Purge the soul of a Deamonica Netherlord with a score of 9999+
Reclaim a tormented soul trapped within the labyrinthine lair!
Reclaim a tormented soul trapped within the labyrinthine lair with a score of 3333+
Unlock the Sinned Animus character vessel!
Complete a Hunt or Pilgrimage using the Sinned Animus vessel!
For I gazed within thy soul and foundeth only purity perfection!
Complete the entire hat fashion line!
Unlock the Forsaken Headless character vessel!
Complete a Hunt or Pilgrimage using the Forsaken Headless vessel!
Reach the 6th wave of the arenal bloodied spectacle!
Attain a score run of 6666+ within the arenal bloodied spectacle!
Attain local highscores in the Hunts, Colosseum and Dungeon!
Attain local highscores of 2222+ in the Hunts, Colosseum and Dungeon!
Unlock the Blighted Host character vessel!
Complete a Hunt or Pilgrimage using the Blighted Host vessel!
Discover enough items to complete at least 33% of the Itemography!
Discover every item known to the Selestial Universe!
Seek absolution by completing at least 33% of the purification challenges!
Fully redeem thyself by completing all purification challenges!
Unlock the Exalt Husk character vessel!
Complete a Hunt or Pilgrimage using the Exalt Husk vessel!
Unlock the Nascent Cherub character vessel!
Complete a Hunt or Pilgrimage using the Nascent Cherub vessel!
Unlock the Accursed Haunt character vessel!
Complete a Hunt or Pilgrimage using the Accursed Haunt vessel!
Catharsise a score run of 2222+ amidst malevolent monstrosities!
Catharsise a complete cycle of malevolent monstrosities!
Defeat each sinful divergent face of the three Netherlords!
Defeat each malicious divergent face of the three Archmancers!
Discover at least 50% of the fiendish Beastiary!
Discover every sinful fiend residing in the Beastiary!
Unlock the Grave Raiser character vessel!
Complete a Hunt or Pilgrimage using the Grave Raiser vessel!