Army of Two: The 40th Day

chapter 1 section WHAT COULD GO WRONG ?
Spare JB
chapter 2 section MURRAY
Put back the guns
chapter 3 section CRASH SITE
spare the tiger
chapter 4 section A ROOM WITH A VIEW
tell kid to stay hidden
chapter 5 section JUST BLOW IT ALL TO HELL
shot the russian
chapter 6 none
chapter 7 section REVENGE
Kill partner

People say A is not always neg and B is not always pos so watch for that just to let you know.
tips ; A button is neg B button is positives and citizens dont count they can be killed or not, you can just play them from the section you dont have to play the whole thing

SPOILERS!!!

For this achievement you have to make all 6 positive moral choices (SPOILER) Then you must choose to kill your partner at the end of the game. IF you were playing through and you made a negative choice you can go back and correct your choices to all positive by replaying just that section. Once you have corrected all choices to positive moral you can just jump to Revenge and finish up the game and kill your partner. (MAKE SURE to get to the save points after each cut scene otherwise this will not work.)

The reverse of this does work for the negative choices achievement too, though you must kill Jonah at the end.

Note: If you need help remembering where all the choices in the game are, so you can jump right to them using (Mister Buds) solution under one of the 30 gamerscore secret achievements. That helped me a lot when I was jumping back correcting my choices, and it gave me the idea to try this solution. Thanks Mister Buds!!! Also I want to thank Doc Buddha for correcting my solution, it does not matter what happens to the civilians here, just the 6 moral choices.