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 adventure with 100% completion as quickly as possible!
Complete the adventure as quickly as possible!
Complete the adventure with 100% completion!
Collect all Monster Cards.
Complete the adventure!
Complete the game in Beginner or Definitive Mode.
Defeated the Empress Siren.
Complete the game without any Health upgrades and all Heart Squids collected.
Win the highest total in a Hula Contest.
Deactivate all the Towers.
Unearthed all secrets.
Open all Shock Machines.
Avoid startling the Lobster Girl throughout the adventure.
Defeated the fifth Siren.
Obtain all magical forms.
Shock a circus squid.
Witness every magical outcome with Slimes.
Complete a Ghostly Quest.
Upgrade all magic to max.
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.
Ascend to Armor Town.
Defeated the third Siren.
Turn an enemy to an ally by helping them heal.
Obtain the Lucky Amulet.
Enter the Sea Lab.
Defeated the second Siren.
Use the valve.
Reach Tree Town.
Uncovered a possible threat.
Defeated the first Siren.
Have three Monster Cards equipped at once.
Took the tour!
Obtain a Monster Card.