The only way I learned how to use the camera was because of the loading screen hints. Press
simultaneously, then click away!
There are at least a dozen different regions in the game. If you zoom out as far as possible on the map you can see them all and their borders. You start in Siwa and will cross through at least another 2 before reaching Alexandria so there's 4 and I'm certain the story takes you almost immediately to the region to the right of Alexandria for 5.
Just open up the camera, take the quickest, rubbishiest photo you can and keep playing. After your fifth the achievement will pop.
Let's keep on cheevin' together!