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