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.
Add all secret shells to your collection.
Discover those that lurk in the abyss.
Breach the water on the back of a blue whale.
Release fish from all the hidden pools.
Discover the polar region.
Complete the adventure.
Ride the Great White Shark.
Burst 15 fish schools in the jetstream.
Perform a flip while riding a creature.
Witness predation while meditating.
Leap from the water.