Hi Valval. Are you currently studying na sa Melbourne? From my research so far, if you will nominate Architect as your occupation for the 189 Visa, it's ideal to study Master of Architecture para accredited and i-recognize ng AACA yung education mo as architect. So far wala pa akong nababalitaan or kilala with successful assessment sa AACA with only a Philippine undergrad degree (in short, hindi equivalent yung Philippine archi degree sa Australian archi degree).
If you decide to study, you can check out this list of <a href="https://www.aaca.org.au/registration-as-an-architect/recognised-architecture-qualifications/">Accredited Architecture Qualifications</a>.
The more popular option is to nominate Architectural Draftsperson as your occupation and apply for the 190 Visa. With the 190 Visa route, sa VETASSESS ka magpapa-skills assessment and not AACA, so it's not imperative that you enroll for a Master of Architecture. Theoretically, you can take a Master of Science if you want to study. Some people in this forum have successfully migrated with an undergrad archi degree via 190 Visa, so you might not need to study anymore (you can save money hehe).