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