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