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