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.
Catch 160 fish.
Hunt down 65 wild animals.
Find 30 lost crates and barrels.
Heal five people.
Make 25 sun solutions.
Have 350 fame.
Learn an expert skill.
Help two ghosts.
Find father.
Build or repair 10 structures.
Pick 45 herbs.
Find 25 crayfish.
Gather 40 sacks of night flowers.
Become a soldier.
Hunt down 25 wild animals.
Own 500 gold coins.
Find 150 mushrooms.
Have 100 fame.
Gather 15 barrels of algae.
Catch 80 fish.
Learn an advanced skill.
Get a boat.
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.
Own 5,000 gold coins.
Rest 50 times in a camp.
Find 300 mushrooms.
Find 140 eggs.
Find 60 lost crates and barrels.
Find 12 pearls.
Find 12 treasures.