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