Below is a guide on the collectibles and trophies/achievements found during Chapter I: Under a New Sun of A Plague Tale: Requiem.
Perfect Shot Achievement/Trophy
During the Reach the Castle objective, Hugo will lead you to a river.
During this objective, he’ll mention that enemy ships are coming and that they’re going to attack. You’ll have to use your sling to shoot the “ships” (aka pinecones) Hugo throws into the water. Get them all before the cutscene triggers where the kid throws the large rock into the water to earn the Perfect Shot achievement/trophy!
Click here for the next walkthrough on Chapter 2 in A Plague Tale: Requiem!