Here is the full list of all 22 Treasure Hunter Simulator achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Sell 10 items.
Finish 10 jobs
Buy your first metal detector.
Sell 5 items.
Find 20 common items.
Find 10 common items.
Find 5 rare items.
Finish your first job
Sell your first item.
Find your first legendary item.
Find 5 items.
Find your first rare item.
Find your first item.
Find 5 legendary items.
Travel the world.
Buy your first digital detector.
Find 10 legendary items.
Reach the top prestige level.
Finish 5 time trials.
Take 20 photos with your PDA.
Have a total of 1000$.
Finish the story mode.