Here is the full list of all 12 Atom Fishing II achievements.
Catch any 100 fish
Catch any 10 fish
Catch any 1000 fish
catch 100 kg any fish
catch 1t any fish
catch 10t any fish
catch 100 any fish on spinning
catch 500 any fish on spinning
catch 1000 any fish on spinning
catch 500 any fish on float bait
catch 1500 any fish on float bait
catch 4k any fish on float bait