The goal is to get three head shots in succession by using the precision ability. Now, you would wonder how to get the precision ability. Well, after you complete the mission with Kuo in the graveyard. you would have to do a mission called “good gets better” the precision ability will unlock.

Here are some tips:

1. Locate a group of enemies for you to do it.

2. In order to aim, hold L1, then up to zoom and R1 to fire the bolts.

3. Make sure that all of them are head shots.
Hint: You can also do this on top of buildings. Some gamers say that it is easier to hit the enemies through their heads at a higher angle.

4. And there you have it!

If you seek on viewing the guide on video, here it is located below: