I think this was a port from the original Xbox. How it was architected was interesting; DLLs used as separate modules. This caused some issues as the DLLs automatically clears out static variables which wasn’t evident when reading the original source code.
I remember implementing 3d audio positioning by creating a sound cone. It wasn’t a feature for the Playstation 3. A sound cone was needed so that the volume could decrease when it was around the player but not when it was in front.
I had a hand in implementing the achievements for this one. Our tester at the time was amazing and probably near the game inside out after having to complete it X amount of times perfectly.