Chapter 15

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

Past the Gates of Hell (a specific location), you will see floating platforms. Instead of using them, run to the end of the hall to your right to find another chest.

After obtaining the previous chest, use the floating platforms. Once 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 (a specific action), head straight past the first set of safety platforms (areas that prevent falling) 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 form) to open it. This chest should grant you the Treasure Fanatic achievement.