Here is the full list of all 40 Shantae and the Seven Sirens achievements.
Complete the adventure with 100% completion!
Complete the adventure with 100% completion as quickly as possible!
Complete the adventure as quickly as possible!
Complete the game in Rule Breaker or Full Deck Mode.
Avoid startling the Lobster Girl throughout the adventure.
Collect all Monster Cards.
Turn an enemy to an ally by helping them heal.
Unearthed all secrets.
Witness every magical outcome with Slimes.
Open all Shock Machines.
Revitalize cellular functions.
Shock a circus squid.
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.
Deactivate all the Towers.
Defeated the fifth Siren.
Obtain all magical forms.
Complete a Ghostly Quest.
Unearth a buried treasure.
Learn all magical dances.
Upgrade all magic to max.
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.
Defeated the second Siren.
Use the valve.
Win the highest total in a Hula Contest.
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.