Here is the full list of all 17 Ys I Chronicles+ achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Confuse and astound the townsfolk.
Drive a hard bargain with Pim.
Receive a free Short Sword.
Complete Ys I on any difficulty.
Unlock all details for all non-boss bestiary entries.
Completely fill the character notebook.
Max out your money.
Receive a free Talwar prior to entering the tower.
Complete Ys I on Nightmare difficulty.
Complete Ys I Time Attack.
Level-up Feena.
"Measure" Feena.
"Measure" Feena in the creepiest way possible.
Rescue Luta Gemma from monsters in the field.
Listen to Reah recite her poem.
Make Dogi break through three different walls.
Master every achievement in Ys I.