You need nine Bendy cutouts in the Music Room in Chapter 2 for this trophy. Each time you turn on the projector, you need to go down to the music room and watch the cartoon for a moment. You can either watch it all or wait for the projector to click off before heading back upstairs to the projector room. Once you get back up, you will see that a Bendy has appeared in front of one of the chairs in the room below. You need to repeat the steps to make Bendy appear nine times. Once you have nine Bendy cutouts, you need to progress the game and solve the music puzzle to open the door for the trophy to unlock. It will also unlock
if you don't have it yet.