Degree

No, absolutely not. I myself study in an autonomous college. There is no problem with a degree from autonomous college. It is absolutely valid.
Good luck.

Yes, Graphic Era Hill University is affiliated with AUCTE.

Yes, you can. Write an application and submit it in DEAN Andhra Pradesh office after getting signed by your HOD and Faculty advisory. DEAN Andhra Pradesh approves and send it to academic section, then academic section take care of remaining tasks.

AME will not take you to a pilot's seat in the cockpit. The requirement to become a pilot is 10+2 with 50% marks in PCM, if you satisfy the criteria then only you can take admission and pursue your CPL training. After the completion of the training, you will be issued a license by DGCA. Only then you can apply and become a pilot.

Yes, you will get a certificate after the completion of your B.Des.

Hi Parul. You can find the most suitable college of your own choice. You just need to click the link : https://www.shiksha.com/design/fashion-design/ranking/top-fashion-design-colleges-in-india/94-2-0-0-0
It contains college's placement, fees, exam etc. All the information about the courses or degree is available in the link which I've mentioned above.

You can't opt for BCA, as you don't have Maths. But, you can apply for BBA.

You can directly visit your university with your documents, like mark sheet of your graduation. They will provide you degree within 80 days.

Yes, you definitely can get admission in Master's degree in any foreign language. You are eligible for that. You can take admission in a good college or university.
Good luck.