Go to system setting,than console settings, than time zone, and change your time zone to the one on the very bottom. After you do this get back on Halo:reach, play a game in which you can earn credits,save, than go back to your dashboard and change your timezone back to what you originally had it set as. After all this is completed you should be able to earn credits again.

Go onto the Campaign Menu with your Main XBL Account
Press the guide button Sign out
Create a NEW Profile
Play Local on the new account you made
Sign Out
Sign into your main XBL account
Check Your Challenges.

1. Oni-Sword base/target locator glitch: What you will want to do for this glitch is to first start up campaign on the level on the sword base level (make sure scoring is on). After that head to your right and continue downhill past the enemies(without shooting them), after you do this there should be a target locator thingy on the left hand wall, pick that up and hide behind the crate or go to the very back(which is easier) until it says "checkpoint reached", after that fire the target locator in the middle of the enemies and should should receive a lot of credits and a killionaire. Revert to last save and repeat.

2. Challenge Reset Glitch: Go work on a challenge until you have it done but 1 kill. Then go get that 1 kill, and right when the challenge pops onto your screen unplug your Ethernet cord and adapter and once you disconnect sighn back in. You will get the credits and the challenge won't be completed. (Don't Abuse)

3. Campain Challenge Glitch: Whenever there is a challenge that has to do with the campaign you can use the above glitch to combine with this one. First you will want to complete all but one of the kills required to complete the challenge and than go to the same spot you go to in the "Target locator glitch", than first the target locator and when it say "challenge completed" unlug your ethernet/wireless adapter and when the message pops up "disconnected from xbox live" plug it back in and select "connect to xbox live" after this happens you should have the credits from the challenge but the challenge will still be left un-done. (Don't Abuse)

4. Winter Contingency: On heroic start up the mission Winter Contingency with team scoring enabled. Go through the entire mission without dying. When you reach the end of the mission activate the generator. Once activated a cutsene will start. Hit A then Y to skip the cut scene then immediately press start, save and quit. Once the game finishes loading you will be brought back to the Campaign screen. All you have to do is hit Resume Solo Campaign and watch the loading screen which will take you to the scoring screen and you will receive 200cR just for watching the game load!

Once the game finishes loading you will be brought back to the Campaign screen. All you have to do is hit Resume Solo Campaign and watch the loading screen which will take you to the scoring screen and you will receive 200cR just for watching the game load!