Here is the full list of all 21 Treasure of Nadia achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Dig up a talisman of the gods
Dig up a royal talisman
Dig up a grand talisman
Catch a hammerhead
Catch a great white shark
Dig up a silver talisman
Dig up a gold talisman
Solve all ancient temple puzzles
Buy all the multivitamins
Buy everything from the bait shop
Fully impress Jim
Find every Kamasutra page
Complete the main story
Find everything in the game
Craft every item you can
Light all torches
Catch a rockfish
Catch a tuna
Catch a seaperch
Dig up a jade talisman
Dig up a stone talisman