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