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