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