Halo: Reach Cheats :
Secret - Get points for doing nothing
Although not the richest way to mine credits in Halo: Reach, I have found a useful and unskilled way to gain them for those of you who want to level up the 'easy way' without putting in the work. It's pretty simple really. When you're taking a break from the Xbox 360 just turn on Halo: Reach, go to the Forge(any level, any settings), and leave your character standing there without pausing it. That's it! The Forge mode will gain credits for time spent in the map. You can expect at a rate of +3000 an hour, which can really add up if you leave it there overnight or something.
IMPORTANT: If the game gets paused it won't be gaining anything for you, so if you're planning to leave it there for ages you had better make sure that  your controller isn't going to go flat.  People aren't going to be messing with it. [and 3] You're console isn't set to turn off when it's idle for a certain time limit. You also won't get credits if you fail to end the forge session properly; that just means you have to go to the pause menu, select "end game", and view the match results screen(which is where you're assigned the credits).
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