I have two I-485 filed one based on marriage and the other employment

You should not have to withdraw anything. The local office should order your file from the service center. If this does not get done soon, then...

I-20 terminated. Asked to leave within 15 days. Got married. AOS?

Sure, aos is possible.

Do I need to restart my green card petition if I change employers?

No, you need to start over from the beginning.

Can i get an annulment if i am married to an illegal immigrant that was deported ?

Possibly, you should consult with a family law attorney.

What does your divorce decree say about medical insurance etc...? You might be responsible or partially responsible.

What are the best options/course of actions for a LPR in regards to foreign fiance/spouse

Become citizen, then either file K-1 or marry ion foreign country. K-3 visas do not generally work any more because the I-130s are approved...

Can we legally adopt an adult from another country like Vietnam

Maybe, but you cannot confer an immigration benefit.

Can I help a friend from being deported

Maybe the marshals can help him obtain a U visa. You personally, I do not think so.

Is a lawyer allowed to file an I-485 on a service center that has a faster processing time like CA and NE (or so I think)....

You can file based on where you reside. Not where your lawyer resides.

Immigration, informal marriage, divorce

and your question is?