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