You need a visa for Pakistan if you have an Australian passport
Visa options for Pakistan (2)
Electronic visitor visa
Travelers need a visa to visit Pakistan for Business or Tourism. An eVisa is the fastest and easiest way of obtaining a visa for Pakistan because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically.
This is not offered by sherpa°.
Apply on the government site.
Electronic travel authorization for Tourism
Travelers need a travel authorization to visit Pakistan for Tourism. Travelers must submit their intent to travel at least 48-72 hours before the intended trip to Pakistan and submit their online visa application through the Pakistan Online Visa System. Once received, the applicant will be emailed an Electronic Authorization to Travel (ETA). Travelers with an Electronic travel authorization will obtain a Visa upon arrival. Please check the source for more details.
This is not offered by sherpa°.
Apply on the government site.