Here is the full list of all 12 ABZU achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Complete the adventure.
Release fish from all the hidden pools.
Find all the meditation statues.
Discover the polar region.
Add all secret shells to your collection.
Breach the water on the back of a blue whale.
Ride the Great White Shark.
Discover those that lurk in the abyss.
Perform a flip while riding a creature.
Witness predation while meditating.
Burst 15 fish schools in the jetstream.
Leap from the water.