Might be helpful giving us a list of countries you intend traveling through rather than expecting info for random selections out of 250 countries.
There is a wiki entry for visa requirements for australians that is pretty accurate for those flying in, but not always correct for those entering at land borders. Chile, Paraguay, India are three such.
As well as visas, you also need to look at Carnet requirements, especially if you need to renew it on the road.
As well as some countries needing you or your passport to be back in your home country when applying for visas, there is also the sometimes major problem that some visas are only good for first entry within a certain number of days of date of issue and some are pretty tight
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