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