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