to get this once you spawn the monster in front of city hall run left and towards the back you will see two barrels blow them up duck under the first trip wire and take a quick right shoot the box in front of you so they all blow up then remember to either defuse both trip wires or shoot them make your way to the door in front and bash x until you open it. the monster will hit you but it wont stop the x button mashing and once your in your trophy will pop since you didn't fight her