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