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