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