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.
Add all secret shells to your collection.
Discover the polar region.
Witness predation while meditating.
Find all the meditation statues.
Ride the Great White Shark.
Complete the adventure.
Discover those that lurk in the abyss.
Burst 15 fish schools in the jetstream.
Perform a flip while riding a creature.
Leap from the water.