Here is the full list of all 32 Another Crab's Treasure achievements.
Defeated the Consortium.
Learn all adaptations.
Unlock all skills on the Path of The Hermit.
Defeated the Curdled Carbonara Connoisseur.
Defeated the Scuttling Sludge Steamroller.
Defeated the Royal Shellsplitter.
Fully upgrade Kril's fork.
Try on every shell in the game.
Find a certain hero's helmet.
Unlock all skills on the Path of The True Crab.
Unlock all skills on the Path of The Predator.
Get your shell back.
Defeated Firth.
Defeated Praya Dubia.
Defeated Camtscha (For real.)
Defeated Camtscha.
Defeated Inkerton.
Defeated Petroch.
Shoot a crab with a gun.
Defeated Roland.
Defeated Voltai.
Purchase some insurance.
Defeated Topoda.
Defeated Heikea.
Defeated the Diseased Lichenthrope.
Defeated the Ceviche Sisters.
Defeated Pagurus.
Fall off a cliff.
Start the treasure hunt.
Defeated Magista.
Defeated a miniboss.
Defeated Nephro.