Just got this
Level: Act 3 - 6 "A Rock And A Hard Place"
Difficulty: Easy, Normal, BattleToad! (I did mine on Battletoad)
You should start with Pimple punching enemies, the red thing (OWTH) that breaks the tree, Pimple again, and finally the Photo girl (Bratty)!You want Bratty, which is when a giant phone fills your screen and you have to click to take a photo of the enemy.
The achievement requires that they are close to you when you take the photo (
). It's that simple! I waited till an enemy overlapped the circle or was pretty close.
If you want a time limit I waited 4 - 5 second on the first enemy. If you die the checkpoint is right when you become Bratty. So no worries if you die!
That's all you have to do!