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