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.
Learn from the wise.
Find an ancient creature.
Follow the light.
Encounters with the cybernetic kind.
Discover a submerged culture.
Take Whalie to Water Planet.