Here is the full list of all 19 Seablip achievements.
Visit 10 islands.
Build or capture a ship.
Die 10 times at sea.
Pet a pig.
Find a treasure chest underwater.
Lockpick 25 treasure chests.
Win your first sea battle.
Find Whalgrim's realm.
Win a sea battle by accepting a peace offer.
Escape a sea battle.
Complete the Spirit Bay puzzle.
Defeat 7 bosses from the most wanted list.
Give 25 or more gifts to your sailors.
Hire a parrot and let it help you in battle.
Villagers moved to Main Island.
Upgrade your house.
Your best friend.
Find your first Diamond.
The tool to catch them all!