Do I need an overseas penal clearance certificate
Requirements for applications for Australian citizenship (Conferral, General eligibility or Other situations)
The following requirements apply to the period of time you have held a permanent Australian visa.
You need an overseas penal clearance certificate if:
you lived or travelled overseas since the age of 18 years, and
the total time you spent overseas adds up to 12 months or more, and
the total time you spent in one country adds up to 90 days or more.
If this applies to you, provide an overseas penal clearance certificate from each country where you spent a total of 90 days or more in.
We could also ask you to provide a certificate in other circumstances.
We have to see the original overseas police clearance and we will keep certified copies with your application.
https://immi.homeaffairs.gov.au/help-support/meeting-our-requirements/character/character-requirements-for-australian-citizenship#content-index-2