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