Hey just thought I'd save sometime for people who were crushed by the ending of the game, So I present a insanity save :D
When you rehash and resign and put it on your usb, Load the restart mission save, Unfortunately the auto save is just a bit too far for the cheevo to pop.
Now when you do load restart mission (Guess I should say spoilers just in case you clicked this by accident lol) You shall be outside of the citadel's beam thingy :D so you will have to shoot the 3 husks and the 1 marauder, It's pretty simple you may die a few times but totally worth it :D Any who after all that, you will have to hear the conversations again, but I turned off choosing choices thing so it should be a bit faster. Just make sure to renegade interrupt ;D
Anyways after that and some more talking, You will have to make a choice out of 3, Choose whatever one you want. Then after you choose the cheevo should pop up.
If there is any problems i'd be glad to help :D
*Edit I forgot your gonna need the Dlc from ashes sorry :(
Save - http://www.mediafire.com/?z8jrb6kf72iw6dd