I would still understand, and I'm not Australian. It's not really exclusively Aussie people who say that.

Catalan: Hola (hello); bon dia (good morning); què tal? (what's up?); com va? (how's it going?) com estàs? (how are you?).

well
on Croatian
Hello - Zdravo or Bok
what up? Šta ima?

にほん～ごっ　　こんにちは！～　

Russian : privet
Ucranian : privit :ywave:

Many words for that in Finland: Terve, Tere, Moi, Moro, Moikka, Hei and the list goes on and on and on because our language is nice and flexible so there is no limit for variations. Those I just said are the common ones.

Chinese : 你好 ni hao
Hokkien(Chinese Slang): lu ho
Malay : apa khabar

In Tamazight - kabyle (one of the Tamazight/Berber languages)

Hello (casual) - Azul
Hello (to one Male) - Azul'felekh
Hello (to one Female) - Azul'felem
Hello (to many people) - Azul'felawen

or

Good morning - Svah'l khir

In Vietnamese: Xin chào or Chào bạn!

Norwegian!

Hei, heisann, hallo!
Står til? Hvordan går det? = How are you?

Sjallabais x)