Episode 1. Once you get into your parents bedroom use the camera on the right to get film strip. Then enter the dark room on the right. Pick up latent image on cabinet on the right and the duct tape under the bench. Use the film strip and latent image with the film enlarger on right. Then interact a the the safe on the right. Use code 107 to get developing liquid bottles. Use the bottles with the containers on bench. The use latent image with containers. After a little dialogue, the achievement will pop.