Augustus' Res Gestae (literally "things done", sometimes translated as "Deeds of the Divine Augustus") can be found online in a couple of places.

Our buddy, Bill Thayer, has posted the English translation (by Frederick W. Shipley for Loeb) alongside the Greek and Latin text of the original inscription on his Lacus Curtius website here.

You can also find it at Classics MIT, here. Translation by Thomas Bushnell.