To unlock the "Back in Time" trophy in Life is Strange 2 - Episode 2: Rules, you need to find the first optional collectible at a cabin in the woods near the start of the game.
After refilling the canteens by the river, the pair walk back to the cabin. To the left of the cabin is a tall tree with a wooden platform. Sitting on the platform is a metal box.
Look at the box to get a second option for Daniel. Get Daniel to lift the box down. When it lands in the snow, inspect it to get a Power Bear badge.