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.
Completely fill the character notebook.
Ensure that Maria is not amused.
Oh God make them go away!
Max out your money.
Make all the animals in Ramia Village absolutely adore you.
Receive and eat four unique homemade food items.
"Measure" Tarf.
Raise Tarf to max level.
Find and speak with Aldow.
Eliminate all the monsters in Gila's basement.
Burn 50 villagers.
Receive a free Short Sword.
Receive money from a duck.
Scatter apples violently across the floor, most likely bruising them horribly.