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