Resident Evil: Operation Raccoon City

This is a combat related trophy and it can be done either in Campaign Mode or Versus Mode. For the trophy, you must simply get infected at least 13 times. The only way to get infected is by letting zombies bite you or vomit acid on you. There's also a small chance that Lickers can infect you with their grapple, but it's very low. All zombies in the game are infected with the T-Virus. Once you're infected, your health gauge will turn blue and will drain overtime. Use Antiviral Sprays to cure your infection or you'll die and become a zombie. You'll most likely unlock this trophy without even trying for it. You can keep track of this in the "Records" found at the main menu screen and then scroll over to the "Global" tab to view stats.