The quickest way to get this achievement is to find and flash 'The Bear'/Ignited Freddy until 'The Fox'/Ignited Foxy spawns. Flashing him in the room he appears in will kill you. Letting the main power run out will also grant a death, which allows the achievement to be somewhat idled. Ignited Foxy can be faster though due to it taking around 2-3 minutes to idle out the power and wait through the power out scene.