Resident Evil: Operation Raccoon City

Best Farm Location: Gone Rouge - In the area with the Tyrant, extract the parasite sample from the Tyrant and go to the objective marker. The Tyrant will wake up now run around the room looking for the parasites and kill them before they attach to zombies. I like doing into the rooms with the key cards that you need to collect as they have the most parasites in their rooms. Once done, run back down to lasers where you got the sample from and kill yourself with the lasers. You'll respawn again so repeat this method over again until the trophy unlocks.

This is a combat related trophy and it can be done either in Campaign Mode or Versus Mode. For the trophy, you must simply kill 31 Parasites. Parasites are another bio weapon from Umbrella. These creatures crawl around on the floor like spiders and search for zombie hosts. Once it found a suitable host, it'll attach itself onto the zombie making them stronger. For the trophy to unlock though, you want to kill the parasites before they attack themselves onto a zombie. If they do attach to a zombie before you kill it, then shoot the Parasite Zombie’s body to detach the Parasite off its host. Simply shoot them a few times to kill them. You can even stomp to death in one hit if they're close enough to you. 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. Note that I never personally encountered these monsters in Versus Mode, but Parasites can be found in the Versus map called Train Wreck (Thanks to Quicksilver661). I still suggest you farm the kills on Gone Rogue.

Parasite