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