Infinite Submachine Gun:
Beat either alternate scenario with an A or B ranking without using any health sprays.
Infinte Gatling Gun:
Beat either alternate scenario with an A or B ranking without saving.
Infinite Rocket Launcher:
Beat either regular scenario with an A or B ranking.
Picture of Rebecca:
Take the east exit out of the basement and go to the area with the two demon dogs and a manhole. When the two dogs are dead, have your back facing the manhole and walk forward until the camera view changes. Arm your shotgun and shoot until bullet holes are on your TV screen.