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 adventure with 100% completion!
Complete the game without any Health upgrades and all Heart Squids collected.
Collect all Monster Cards.
Deactivate all the Towers.
Unearthed all secrets.
Open all Shock Machines.
Defeated the fifth Siren.
Obtain all magical forms.
Turn an enemy to an ally by helping them heal.
Shock a circus squid.
Complete a Ghostly Quest.
Witness every magical outcome with Slimes.
Unearth a buried treasure.
Learn all magical dances.
Defeated the fourth Siren.
Revitalize cellular functions.
Locate the sunken ship remains.
Fell for a double cross.
Open a Shock Machine.
Upgrade all magic to max.
Defeated the third Siren.
Enter the Sea Lab.
Win the highest total in a Hula Contest.
Obtain the Lucky Amulet.
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.
Avoid startling the Lobster Girl throughout the adventure.
Ascend to Armor Town.
Have three Monster Cards equipped at once.
Complete the adventure!
Complete the adventure as quickly as possible!
Defeated the Empress Siren.