Snapshots are bite-sized challenges that drop you in the middle of a game. They are not milestones that are unlocked through normal progression of the game. Many of these challenges help teach the player core aspects to how the game functions. There are two ways to access snapshots for a game; the first is to navigate to snapshots from the main menu. The other option is to press left on the
to load them.
You only need to complete a single Atic Atac snapshot for this one. The quickest and probably easiest for those unfamiliar with the game mechanics would likely be snapshot number four, titled "Demon Dodger".
To complete the challenge, you need to kill ten monsters while being pursued by an invulnerable enemy demon without leaving the room.
At the start, move your character to the right corner at the start, and then move clockwise to keep the demon away. Make sure your character is completely in the corner and use your d-pad to move so that you don't accidentally move into an open door and reset your progress. Then spam the
button to keep killing spawning baddies. Once you kill ten, you'll complete the snapshot and your achievement will unlock!
For those interested in tackling all five snapshots for Atic Atac, I've got a solution set up over on the other related achievement to help you out!