Trying to platinum - help!

I have already gotten most of the achievements, but I am missing 3 endings. I need The star, The sun, and temperance achievements for going with the aldecaldos, assaulting Arasaka HQ with rogue and giving Johnny my body. I know I can return to the point of no return after getting an ending, and I know how to get the endings, but what I want to know is can I get all three on a single save? I also want to get the new Phantom Liberty ending, can I get that one too? What would I need to do to get all of these?

Thanks for the help!