The main thing you will need is the Rocket Launcher. A direct kill with this gives the "Direct Hit" bonus.
Set the game to Capture the Flag, on the Frostbite level. Your opponent will be one to two AI's on very easy (I recommend one). Set Abilities and Equipment off. Set points/flags to 10 or 15.
In the beginning you will be able to run across the bottom to find your opponent. Quickly dispatch him to avoid loss of life, then grab the flag. Don't go rushing back to capture the flag, though. Instead, run back to your base as a way of gathering ammo. ASAP, switch to Rocket Launcher, then use the bouncer pad to vault over to your opponent's base, collecting a shield on the way. WHENEVER you see the opponent, go for a headshot, or at least a Direct Hit. Then, run back along the bottom to get more & more ammo. After a while, capture the flag and re-do the strategy. It's not super-fast, but you can get about 1000 credits in about 9 minutes, especially when Juice-Tin and/or Addison-R are present.
