Here is the full list of all 17 Depth Hunter 2: Deep Dive achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Swim underwater for 100km
Take 200 high quality snapshots
Complete Location 3
Achieve an accuracy of 95% or more, with 200+ fish.
Achieve an accuracy of 85% or more, with 150+ fish.
Take 50 high quality snapshots
Complete Location 2
Swim underwater for 10km
Collect 50 treasures
Catch 100 fish
Complete Location 1
Achieve an accuracy of 75% or more, with 100+ fish.
Achieve an accuracy of 65% or more, with 50+ fish.
Collect 100 coins
Catch 30 fish
Catch 5 fish
Spend 24 hours underwater