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.
Oh God make them go away!
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.
Max out your money.
Receive money from a duck.
Make all the animals in Ramia Village absolutely adore you.
Receive and eat four unique homemade food items.
"Measure" Tarf.
Burn 50 villagers.
Raise Tarf to max level.
Find and speak with Aldow.
Eliminate all the monsters in Gila's basement.
Receive a free Short Sword.
Scatter apples violently across the floor, most likely bruising them horribly.