Unreal Tournament III

The "Rocket Scientist" award is earned for getting 15 kills with the Rocket Launcher in a single match.
The "Flak Master" award is earned for getting 15 kills with the Flak Cannon in a single match.

Suggested Setup
Gametype: Deathmatch
Map: Morbias Arena
Mutators: Speed Freak, Weapon Replacement (For Rocket Launcher award: Enforcer to Rocket Launcher, For Flak Cannon award: Rocket Launcher/Enforcer to Flak Cannon)

This is the same as the other weapon trophies, other than the fact that you have to get two sets of ten awards for one trophy. If working on Get a Life at the same time simply switch days after getting 10 matches done with one weapon, then move on to the other.

If you wish you can leave the Rocket Scientist awards until you are grinding the 200 kills a day with the Titan mutator, as you will still be using the rocket launcher to kill enemies in those matches.