Here is the full list of all 16 POOLS achievements.
Chapter #6 Completed
Chapter #5 Completed
Performed a dive worthy of an award
Chapter #4 Completed
Chapter #3 Completed
Chapter #2 Completed
Did you hear that?
Chapter #1 Completed
Heard the ominous bellowing
Restored a layer of the scattered art piece
Restored all layers of the scattered art piece and greeted a newborn being
Made close contact with the residents of a dark place
Caught a glimpse of a timid being
Witnessed unfathomable elegance
May contain small amounts of swimming toys
You don't follow the most obvious path