Damnation

At fixed periods in the game, you will be required to travel to another part of the area and the only way to do so will be by motorcycle. To ride a chopper press while stood next to it and hold to accelerate, there is a compartment on the bike for a passenger to hold on and fire at enemies in a drive-by style but note that any kills in this manner will not count towards the total as you did not necessarily do the killing.

In certain parts of your journey from one point to another you will come across hostiles and it is these you need to line up and drive straight into. The bike is pretty fast and enemies move around a bit so it can be tricky sometimes, you can boost by pressing to activate a turbo if you are lined up properly which helps a little but this is pretty much sporadic in terms of results. Though instances of running over people are few and far between, there is a great place to farm this if you need to. Once you complete Mesa Dorado and start the Motorcycle Chase part of the game, the second checkpoint has a long straight bridged section about the width of three of the bikes that you're on and a stream of serum addicted zombie types just jump down in front of you from out of nowhere. Charge them down and once you reach the end, reload the last checkpoint then rinse and repeat. You can easily knock out about 10 per run without stopping to go back.