As far as i know you dont need any birthcertificate. You passport is your birthcertificate here. Send all the copy of your asylum granted papre plus I94 they gave you after approval. Send the copy of Workauthorization card (EAD) and rest of the required documents listed on I485 form along with some $$ check addressed to USCIS  oh yeah also medical clearence paper which is the most. Go to any of the doctors associated with USCIA medical verification(google it) and pay some money and get it. Send it to USCIS and wait for thier received letter. Sometime your fingerprint notice comes earlier than your received letter which doesnt really matter , take the finger print on their date and wait. (Note; i am not an expert on these, i am only writing what i know and again i might not be correct as requirements keeps changhing so please follow everysouce you can and know of before applying).