DLCs not working

I'm sorry to hear you're having trouble getting into the Crimson maps, that sounds very frustrating. Since you have already tried deleting the map pack and clearing your cache, I have one other suggestion to try: re-download your profile.

I have heard of this working for the very same issue, so there is hope that this simple fix will get you into the game and working on those map pack achievements.

To re-download your profile, follow these steps (you must be signed out of your profile):

1) Hit the guide button. Below the options to sign in and create a profile is download profile.

2) Enter the email address and password associated with your account.

Depending on the size of your profile, this may take a few minutes. I just did it a few moments ago and it was quite quick. Hope that helps!

I think you can only use them in quick race & online modes. Not career.

I recommend you not continue using that drive from here on out. Modifying the hardware is actually an offense that will get your whole console banned permanently.

I fully understand not being able to afford something, but that doesn't negate the terms of use.

XBL agents can appeal on your behalf and get an override, allowing you to redo License Transfer if the other steps have been done. Suggest you call them on your national support number (listed below; choose Option 2 when you call).

When you move from one console to another, the License Transfer step allows you to earmark content as belonging to the new console. Sign in, do Settings | Account | License Transfer then download all your content. If that failed, then call back to the Xbox
LIVE agents and have them review your content purchase history, and find the items which did not transfer. They can escalate the case if they cant's solve it.