Fracture Hills is a level found in Autumn Plains. This trophy is obtained after defeating all the Earthshapers in the level, which are the big stone Golems with pickaxes. Most of them can be pushed into the lava pits by charging into them, but the ones found near the end of the level will require you to start Hunter's Orb challenge. After learning how to headbash and freeing Hunter from the stone by completing the Alchemist's Orb challenge, you will follow Hunter as he shoots the remaining Earthshapers with his Bow, headbashing them while they're stunned. After all of them have been defeated, the trophy will pop.

Keep in mind that if you choose to do the Alchemist's Orb challenge before getting headbash, you will have to complete it again after re-entering the level, because Hunter will get stuck again.