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.
"Measure" Feena in the creepiest way possible.
Confuse and astound the townsfolk.
Level-up Feena.
"Measure" Feena.
Receive a free Short Sword.
Complete Ys I on any difficulty.
Max out your money.
Receive a free Talwar prior to entering the tower.
Completely fill the character notebook.
Unlock all details for all non-boss bestiary entries.
Complete Ys I on Nightmare difficulty.
Complete Ys I Time Attack.
Drive a hard bargain with Pim.
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.