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