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