Easy way to beat the game:
1) Pick a race.
2) Win your first battle.
3) Go to the main menu and press "c" on your keyboard.
4) Type in "skippy", but don't hit enter, just press main menu.
5) Enter another battle, and press "h".
The fastest way to get credits is by doing a 1v1 Capture the Flag (25 flags) at the map: Frostbite. Make sure that you turn your difficulty, and your opponent's difficulty to 'very easy', so that you can kill your enemy with ease.
Glitch for all badges: Start the game with a new profile. Choose any class (preferably the gunslinger). Let the red Metabii enemy on the ship kill you without attacking him back. Once you die, reload the game, and a glitch will occur where it flips through all four maps. Click the fourth map's red icon (next battle), and then just press spacebar.