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!
Collect all Labyrinth maps.
Destroy 20 bones with the Bubble Shield.
Discover the secret Labyrinth.
Complete the hidden training room.
Defeat the Pirate Master's true form and save Scuttle Town in record time!
Complete the game without any Health upgrades and all Heart Squids collected.
Defeated the Pirate Master's true form without taking any damage.
Defeat the Pirate Master's true form.
Collect all of the Dark Magic.
Defeated the Pirate Master.
Defeated the Pirate Master without taking damage.
Collect all Heart Squids.
Defeated the Steel Maggot without taking damage.
Defeated the Steel Maggot.
Help Ammo Baron fire the Palace Disruptor Cannon.
Collect the Enchanted Blade.
Obtain the Spirit from Abner.
Play keep away with the Ammo Baron.
Defeat 50 enemies using Pirate Weapons.
Defeated Dagron without taking damage.
Defeated Dagron.
Collect 50% of the Heart Squids.
Sample the entire menu!
Obtain Manly Musk.
Collect 50% of the Dark Magic.
Obtain the Fossil.
Defeated the Squid Baron without taking damage.
Defeated the Squid Baron.
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.
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 without taking damage.
Defeated the Cyclops Plant using only Pike Balls.
Obtain Squid Oil.
Defeated the Cyclops Plant.
Release the Ham Stink.
Defeated the Ammo Baron.
Defeated the Ammo Baron without taking any damage.