HOW TO APPLY FOR PORTUGUESE CITIZENSHIP
The requirement is you have to be married to a Portuguese national for at least 3 years.
This is a link in Portuguese that explains the process:
You need to feel a form available here:
Get your signature recognized (at a Portuguse Embassy abroad or through a lawyer)
Pay 250 EUR crcpagamentos.irn.mj.pt/pagvisamc.aspx?productid=NAC3
And enclose the following documents:
Criminal Records (from country of birth, country of nationality, country you are living in currently)
Copy of marriage certificate
It takes approximately 1 ½ to two years to get the citizenship.