Here is the full list of all 12 The Lost Bear trophies - there are 7 bronze, 4 silver and 1 gold.
Enter the Snatcher's Lair.
Find the Torch.
Turn on the Headlights in the Scrap City.
Escape the Forest.
Defeat a Hound.
Fall from the Cliff.
Find Walnut's Brother eating honey.
Turn on the Lamp in The Forest.
Defeat the Snatcher.
No deaths on a Single Playthrough.
Smash all of the Firefly Jars.
Return Home.