Here is the full list of all 19 The Sea Will Claim Everything achievements.
Have some tsipouro.
Discover the meaning of the ancient phrase.
Reject Lord Urizen's dogma.
Heal Underhome.
Help the people of the Isle of the Stars.
Guide Sunsquid back to the Electric Continent.
Frubble frubble frubble frubble.
Find all 700 collectibles!
A bit of code The Mysterious-Druid accidentally left in the window's code gives you an achievement when pressing W.
Help the people of the Isle of the Moon.
Gather all the Tokens of the Tomb of the Timber Tyrant.
Derek knew everything about alchemy, too... or so he thought.
Help the people of the Isle of the Sun.
Did you make a cookie for the thoughtful lizard?
Help Niamh with her research so she can go back home.
Set sail to explore the Fortunate Isles. You're not sure what ahoy means, but it sounds nautical.
The mouse had achievements before everyone else did.
This achievement contains tofu.
A smelly old achievement found in a box.