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