Here is the full list of all 23 Farming Simulator 19 achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Cultivate 100 hectares
Complete 1 mission
Breed 20 cows
Breed 50 pigs
Cultivate 10 hectares
Sow 100 hectares
Breed 100 chickens
Harvest 100 hectares
Harvest 10 hectares
Fertilize 100 hectares
Sow 10 hectares
Reach 10 hours of playing time in a single savegame
Harvest 1 hectare
Cut down 1 tree
Fertilize 10 hectares
Cultivate 1 hectare
Fertilize 1 hectare
Sow 1 hectare
Own a bank account with 10 million ingame money
Complete 50 missions
Complete 100 missions
Cut down 25 trees
Breed 30 sheep