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