Can you apply for two EB-1 applications one sponsored by employer and one self-sponsored at the same time?

Theoretically you should able to file for both concurrently. Not exactly why you would need two applications if they contain duplicative content...

You are going to provide documentary evidence that you complied will all of the requirements. If you are trying to slide through without following...

The larger issue is your original entry. Did you enter on a valid visa or are you undocumented. As a DACA reciepient you are no longer eligible...

Why are you worried about being denied? Your question doesn't make any sense.

When should I485 documents reach to the USCIS when September month bulletin says October month is current?

Send in your I-485 when the priority date is current. I would send it in the first week of October.

This is a complicated matter. You should really discuss this with your company's attorney that filed this application.

Who is applying for immigration and nationality act ( INA) section 245(i)?

It's not clear from you question what you are asking. Please rephrase with clearer language and specificity.

Can I apply for I-485 given my current situation?

Once your priority date is current, you can generally go ahead and adjust status.

Will they allow me to re-enter USA?

You should be fine, but if you are really worried you should not travel. It's always safer to not travel in this situation.

What happens if your spouse withdraws their sponsorship?

This is a messy situation. You need to sort out your goals and proceed along one path.