The Direct hit kill bonus is obtained when you kill a person with an explosive weapon. The easiest way to get this kill bonus is to use a Rocket Launcher. The Rocket Launcher can do fatal damage, so it is very easy to get the kill bonus via Rocket Launcher.
How to achieve
Arm yourself with a Rocket Launcher
Set very easy quickmatch, anywhere, any type, but turn off equipment and set it to explosives
Find your opponent(s) and blast 'em with one shot with the rocket launcher!
