Here is the full list of all 38 Hero of the Kingdom achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Destroy the Dark Lord.
Fight 12 battles.
Find 60 lost crates and barrels.
Find 300 mushrooms.
Find 12 treasures.
Catch 160 fish.
Have 350 fame.
Own 5,000 gold coins.
Hunt down 65 wild animals.
Help two ghosts.
Find 140 eggs.
Pick 45 herbs.
Gather 40 sacks of night flowers.
Make 25 sun solutions.
Heal five people.
Gather 15 barrels of algae.
Rest 50 times in a camp.
Find 12 pearls.
Build or repair 10 structures.
Find father.
Own 500 gold coins.
Learn an expert skill.
Find 25 crayfish.
Find 30 lost crates and barrels.
Catch 80 fish.
Get a boat.
Hunt down 25 wild animals.
Become a soldier.
Find 150 mushrooms.
Have 100 fame.
Learn an advanced skill.
Finish the water mill.
Learn three skills.
Get a weapon.
Make a barter.
Leave the home farm.
Saw 10 pieces of wood.
Get working tools.