Can Women Have It All?

"It is so much harder to achieve what you want once you have kids." Sounds familiar?  I hear that a lot at work.  It is inevitable as a young women to wonder how difficult it is to start a family while still want to achieve something big in their career.  It was horrifying to hear your mentor telling you, "you can't have it all kiddo."  Does it mean that you can't have a family if you want to climb up that corporate ladder?  Even when I do have a family, does it make me a bad mother when I choose to put more focus in my career?  How would being away for 9-months to have my baby impact my caeer?  Do I have to find a partner who is willing to be a stay-at-home dad?