Here is the full list of all 21 Ys II Chronicles+ achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Ensure that Maria is not amused.
Make all the animals in Ramia Village absolutely adore you.
Receive and eat four unique homemade food items.
Eliminate all the monsters in Gila's basement.
Burn 50 villagers.
Receive money from a duck.
Scatter apples violently across the floor, most likely bruising them horribly.
Completely fill the character notebook.
Unlock all details for all non-boss bestiary entries.
Complete Ys II on any difficulty.
Complete Ys II on Nightmare difficulty.
Complete Ys II Time Attack.
Receive a free Short Sword.
"Measure" Tarf.
Raise Tarf to max level.
Sleep in three women's beds.
Oh God make them go away!
Slaughter ten generations of gatekeeper.
Find and speak with Aldow.
Max out your money.
Master every achievement in Ys II.