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