Here is the full list of all 40 Shantae and the Seven Sirens achievements.
Complete the game in Beginner or Definitive Mode.
Complete the adventure with 100% completion as quickly as possible!
Complete the game in Rule Breaker or Full Deck Mode.
Complete the game without any Health upgrades and all Heart Squids collected.
Avoid startling the Lobster Girl throughout the adventure.
Collect all Monster Cards.
Complete the adventure with 100% completion!
Win the highest total in a Hula Contest.
Unearthed all secrets.
Witness every magical outcome with Slimes.
Complete the adventure as quickly as possible!
Shock a circus squid.
Complete the adventure!
Defeated the Empress Siren.
Revitalize cellular functions.
Deactivate all the Towers.
Defeated the fifth Siren.
Obtain all magical forms.
Turn an enemy to an ally by helping them heal.
Complete a Ghostly Quest.
Open all Shock Machines.
Upgrade all magic to max.
Unearth a buried treasure.
Learn all magical dances.
Defeated the fourth Siren.
Locate the sunken ship remains.
Fell for a double cross.
Open a Shock Machine.
Ascend to Armor Town.
Defeated the third Siren.
Enter the Sea Lab.
Obtain the Lucky Amulet.
Have three Monster Cards equipped at once.
Defeated the second Siren.
Use the valve.
Uncovered a possible threat.
Reach Tree Town.
Defeated the first Siren.
Took the tour!
Obtain a Monster Card.