There are three Snapshot events in every episode in which the game will tell you a subject to photograph. On the center of the bottom of the screen, the number of Polaroids signify how many photos must be taken in the sequence for full credit. A photo will receive credit if the Polaroid has a green check-mark instead of a red X. Both achievements unlock after the first and third successful Snapshot sequences.
Episode 1- Snapshot 1: Two photos - Brutus and Casey
Episode 1- Snapshot 2: Two photos - Grizzly close-up
Episode 1- Snapshot 3: Three photos - Grizzly on top of the Kill