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