Looking for an attorney that is familiar with the Italian Citizenship laws.

The Italian consulate and the website has a lot of information. You may also ask them for a recommendation.

Should I send both tax returns ( mine and my husband's) if me and my husband filed separately?

In most instances good idea to send both returns with an explanation.

Getting a divorce with a person with a green card that is based off marriage

Yes you may proceed on your own. Permission is not required.

Can I apply for citizenship?

You may file within 90 days of being a lawful resident for five years. You must meet the other requirements as well.

Do I need attorney or I can file myself for us citizenship

There is no requirement to use an attorney.

Can I file I485 during pending for H4 approval?

You may file for adjustment as permitted by your priority date and if otherwise eligible to adjust status. For your priority date eligibility see...

How to get EAD when spouse I-140 is approved?

Either you need to change to H-4 if your spouse has H-1B or file for EAD with adjustment. You should discuss your options with your immigration...

Expired passport is okay, expired status is not okay. For most countries there is an automatic 6 month revalidation of passport.

Require a simple letter for employer

As my colleague noted, contact an attorney directly for a fee estimate.

Incorrect LCA filed for H1B

Recommend your employer work with an immigration attorney rather than try to do this on his or her own. Probably will need to start over.