Dead Rising 2: Off The Record

This is story related if you're successfully arriving on time to each main case file. This occurs on the case 7-2. After the cut scene of the military arriving go to the destination which the arrow points to go in the underground section. Once in the underground (by going through the recently broken gate) go past the army SUV to start the boss fight. He's fairly easy. Just dodge his attacks and hit him from behind with the spiked bat or another melee weapon. Make sure you bring some food as when he does hurt you he takes off a lot of your health. Trophy will unlock after the cutscene has finished or during the cutscene.