To unlock the "Bear Aware" trophy in Life is Strange 2, you must find collectible #2 in Episode 1. Actually, collectibles 2, 3 and 4 can be collected in any order as they are all in the same location.
After your first night out in the woods you will be approaching a gas station. Head inside and head to the counter. There will be some keyrings on the counter. Choose the option to show Daniel the keyrings. After the scene, the trophy will unlock.
Screenshot for reference: