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.
Buy everything from the bait shop
Catch a tuna
Dig up a gold talisman
Dig up a silver talisman
Catch a rockfish
Catch a seaperch
Dig up a jade talisman
Dig up a stone talisman
Find every Kamasutra page
Complete the main story
Find everything in the game
Craft every item you can
Buy all the multivitamins
Light all torches
Solve all ancient temple puzzles
Dig up a grand talisman
Dig up a royal talisman
Dig up a talisman of the gods
Fully impress Jim
Catch a hammerhead
Catch a great white shark