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