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.
Find an ancient creature.
Encounters with the cybernetic kind.
Take Whalie to Water Planet.
Discover a submerged culture.
Learn from the wise.
Follow the light.
Unless they figure out how to open doors.
Reach new depths.