Sarah Connor would've gotten screwed if a Terminator didn't help her out against the liquid one so I don't call her a badass, I call her the woman with a badass robot. Sarah has mostly ran from Terminators and only got lucky she destroyed one just by luring it underneath a crusher or whatever the heck you call it.
Ripley fought Xenomorphs head on and even fought an Alien Queen which is the strongest and most deadliest Xenomorph of its kind.