The Blue Passport enables you to travel to all the countries which have signed the Geneva Refugee Convention, i.e. 145 countries a list of which you can find on www.fluechlingskonvention.de. Australia is on this list. However, you must apply for a visa in advance. Then the respective country will decide whether you must be issued an entry visa or not.
You can apply online here: https://e-visa.co.uk/australia
Please note that you cannot enjoy diplomatic or consular protection by Germany outside the German territory.
I hope my answers were useful for you and I'll be very pleased if you contact me again with further questions. I'm a member of the MBEON-staff and I‘ll be glad to guide over a longer period of time. Mbeon is an online consultancy for migrants via the mbeon-app, which you can install on your smartphone for free. Download it via App Store or Google Play Store. You'll find me In the mbeon-app under my name „München, Frau Müller“ and get confidential one-to-one advice in a safe virtual room, where nobody can wiretap messages. More information: www.mbeon.de.