To unlock the "Trail Angel" trophy in Life is Strange 2, you must find collectible #5 in Episode 1. You won't be able to unlock this until you have progressed all the way through the gas station sequence and end up on the beach at night.
When you are sat on a rock looking at Daniel
... you can look down at a stick near you. Press
. When throwing it, you want to aim towards the gap in the two banks of grass ahead, towards the edge of the left bank of grass -- but don't throw the stick out too far, only a couple of feet past the start of the grass. If you don't get a collectible back the first time, throw again. You might have to restart from the last checkpoint if you try this too many times. At some point you should find a collectible on the stick and the trophy will unlock.
Screenshot for reference: