Here is the full list of all 44 Shantae and the Pirate's Curse achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Saved Scuttle Town as fast as possible!
Defeated the Cyclops Plant without taking damage.
Defeat the Pirate Master's true form and save Scuttle Town in record time!
Collect all Labyrinth maps.
Defeated the Empress Spider without taking damage.
Get Rottytops to Abner Tree without making any mistakes in a single attempt.
Defeated the Cyclops Plant using only Pike Balls.
Defeated the Ammo Baron without taking any damage.
Defeat the Pirate Master's true form.
Defeated the Pirate Master's true form without taking any damage.
Collect all of the Dark Magic.
Defeated the Pirate Master without taking damage.
Complete the game without any Health upgrades and all Heart Squids collected.
Defeated the Pirate Master.
Destroy 20 bones with the Bubble Shield.
Collect all Heart Squids.
Discover the secret Labyrinth.
Complete the hidden training room.
Defeated the Steel Maggot.
Defeated the Steel Maggot without taking damage.
Help Ammo Baron fire the Palace Disruptor Cannon.
Obtain the Spirit from Abner.
Play keep away with the Ammo Baron.
Collect the Enchanted Blade.
Defeat 50 enemies using Pirate Weapons.
Defeated Dagron.
Defeated Dagron without taking damage.
Collect 50% of the Heart Squids.
Obtain Manly Musk.
Collect 50% of the Dark Magic.
Obtain the Fossil.
Use a Pirate Flare to return to Risky's ship.
Defeated the Squid Baron.
Defeated the Squid Baron without taking damage.
Sample the entire menu!
Obtain the Golden Pickaxe.
Obtain all three Mummy Sketches.
Defeated the Empress Spider.
Destroy 10 Spider Eggs before they hatch.
Obtain Squid Oil.
Defeated the Cyclops Plant.
Defeat 250 enemies using Shantae's Monster Whipper!
Release the Ham Stink.
Defeated the Ammo Baron.