A Plague Tale: Innocence

This achievement is unmissable.

Follow Rodric through the castle and you'll wind up in the main courtyard where you used the braziers to clear out the rats. Make sure to snag all the resources lying around if you need them.

When you first enter the courtyard, climb down the ladder to your right and take another right at the next break in the wall. There you will find the Rhododendron, which you'll need as part of the and achievements.

After collecting the flower, gather any other resources you find and follow Rodric to the center of the courtyard under the bridges and he'll show you a fresco. After a few lines of dialogue, Lucas will come bursting out, telling you to hurry to Hugo's side. A cutscene will play and after that, the achievement will pop.