Chapter 15

At the start of the level, look to your right for a hallway. Jump over to it as a beast (a transformation ability) to find a chest at the end.

Past the Gates of Hell, you will see floating platforms. Instead of using them, run to the end of the hall to the right of the platforms to find another chest.

After obtaining Chest #41, use the floating platforms. At the top, run straight ahead to find an opening in the ground. Drop down and run to the end to find another chest.

After activating the platforms by turning the key on the blue cylinder, proceed straight ahead past the first set of safety platforms to the next set. A lone platform nearby holds the next chest.

From your current position, move the camera to spot another chest. Fly over to it as a crow (another transformation ability) to open it. This chest should unlock the Treasure Fanatic achievement.