Walking Dead - 50G
-Bit(killed) 200 times by Nightwalkers.
I found this to be a little faster than the VR BONUS LEVEL 1(DLC)
-Play Trial 10 in single play. As you start, go through the door and follow the hall and you'll encounter a nightwalker. Restart mission again and repeat. Will appear in-game or after restarting. Should take 8-10secs each playthrough. To unlock Trial 10 you must get to Mission 12 in single play. If you hate the game or lazy then do the solution above.