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