- Spartan999
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- Intrepid Legendary Member
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This will get you plenty.
Go for 540 kills in campaign, 3 hours, make sure to set the map to ONI, the difficulty to normal, and turn on all skulls but Iron and Blind.
This will get you right under 5000 cr (which is the most you can get for a single campaign challenge, and you don't want to waste your effort).
Create another one with the exact same settings but for medals instead of kills.
Then go to the Oni: Swordbase mission and target locator farm.
Run the cycle about 70 times, then turn in the challenges. Rinse repeat.
This should earn you ~10000 credits every couple of minutes.