All found in CASR P61.870
https://www.legislation.gov.au/Detai...2#_Toc81486003
In summary:
3 IAP in 90 days, 1 of which in the same category of aircraft ( ie. aeroplane)
2D in 90 days to conduct a 2D APPCH
3D in 90 days to conduct a 3D APPCH
AZI in 90 days to conduct AZI APPCH
CDI in 90 days to conduct CDI APPCH
Circling Approach: Most recent IPC or passed Flight test in past 12 months that included a Circling approach
Single Pilot IFR: Passed test or IPC in a single pilot aircraft, and conducted Single Pilot IFR flight in past 6 months of at least 1 hour and 1 IAP
* the above isn't required if successfully participating in a T&C program or completed OPC that included IFR ops in the past 3 months