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