Here is the full list of all 57 Hero of the Kingdom III achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Get the lockpicking skill to 100.
Achieve 140 fame.
Defeat Earthquaker.
Make 80 weapons or shields.
Get the smithing skill to 100.
Pick 60 locks.
Kill 300 monsters.
Hunt down 150 wild animals.
Make 600 various potions.
Get the combat skill to 100.
Have 5,000 gold coins.
Visit the Azure Valley.
Mine 50 pieces of silver ore.
Destroy all of the orc camps.
Cook 8,000 food.
Find 24 pearls.
Get the mining skill to 100.
Find 120 lost crates and barrels.
Get the cooking skill to 100.
Find 400 eggs.
Find 800 mushrooms.
Get the alchemy skill to 100.
Make 100 healing potions.
Pick 300 flowers.
Get the archery skill to 100.
Make 10 swords.
Mine 50 pieces of iron ore.
Get the fishing skill to 100.
Pick 15 locks.
Get the herbalism skill to 100.
Achieve 70 fame.
Learn the mining skill.
Learn the smithing skill.
Visit the Gray Valley.
Learn the lockpicking skill.
Kill 150 monsters.
Catch a golden fish.
Hunt down 20 foxes.
Catch 100 fish.
Gather 100 berries.
Have at least 1,000 strength.
Cook 2,000 food.
Have 1,000 gold coins.
Have at least 100 strength.
Learn the alchemy skill.
Save the mayor of the Yellow Valley.
Learn the herbalism skill.
Find 30 lost crates and barrels.
Learn the cooking skill.
Visit the Yellow Valley.
Learn the fishing skill.
Hunt down 20 rabbits.
Find 6 pearls.
Find 100 eggs.
Find 200 mushrooms.
Find some treasure.
Kill 50 monsters.