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