We’re filing this under “Strategy” as criminals TOTALLY fear Batman more when he’s got a big head. Honest.
If you want to make Batman, Catwoman, and EVERYONE else look like a bobblehead, follow this easy to use Guide from Achievement Hunter:
To enable big head mode, you have to be playing the single-player campaign in Normal, Hard or New Game Plus mode. Then, use Batman’s Cryptographic Sequencer, hold down both triggers on your controller, rotate your left-stick clockwise and your right stick anti-clockwise for five seconds. Voila!