If you have any documents required for the Immigration, visa application, Tribunal appeal, skills assessment, etc they have to be accompanied by Certified English translation made according to the cerntain requirements.
The best option is to get a translation of your documents from the NAATI certified/accredited translator.
Sure, it is acceptable to provide non NAATI certified translation of the documents. However, not all govermental bodies may accept such translations. Thus, when you lodge an application for an australian passport you have to provide NAATI translation of all documents that are not in Enlgish. So, get it right from the first attempt.
Australian Registered Migration Agent