Brain Surgery Trophy in Burn Zombie Burn!
100 Brains sucked.
How to unlock Brain Surgery
Use the Brain Gun. It can only be used on one Zombie at a time, it sucks the brain out and you then shoot it across the level, other zombies will then be drawn to it and ignore you for about a minute. There's a challenge level called 'Zombie Bait!' that you can use to get the trophy. This trophy is cumulative.