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