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