It is reccomended that you do this with at least 2 people, it is possible solo just more difficult. BO2 Zombies: Solo Origins Easter Egg Guide (Full) - YouTube See that page for more info. Main Easter Egg. This is a guide to show how to do the Origins Easter Egg or the Lost Little Girl achievement. The Main Easter Egg for Origins is linked to the achievement / trophy Little Lost Girl. Other Easter Eggs Elemental Knives Easter Egg.