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