Here is the full list of all 10 Swallow the Sea achievements.
Get kissed by the Orro.
Consume all Vobbles without dying.
Complete Swallow the Sea without dying.
Complete Swallow the Sea.
Consume the Orro.
Become an only child.
It happens to the best of us.
Complete Swallow the Sea in under 4 minutes.
Complete Swallow the Sea without taking damage.
100% Swallow the Sea