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