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