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