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