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