Here is the full list of all 12 Water Planet achievements.
Ascend Airfall Monument
The heart of everything.
Aqua finds its friends.
Unlock ancient future technology.
Unless they figure out how to open doors.
Reach new depths.
Find an ancient creature.
Follow the light.
Learn from the wise.
Encounters with the cybernetic kind.
Discover a submerged culture.
Take Whalie to Water Planet.