A duel between rivals
This is an achievement that takes a few steps between a few missions. Make sure you get this achievement on your veteran walkthrough! There is another achievement with sort of opposite steps. Please read "Good Karma" for more information on that. It is important that for you to get the achievement, you rewind the story. Go to replay mission and hit and it will rewind so you can change the outcome of the story in the end while keeping all challenge and weapon progress.
- Defalco escapes in "Karma."
- Skip Strike Force mission "Second Chance."
- Kill Harper instead of Menendez in "Achilles Veil."
- Spare Admiral Briggs in at the end of "Odysseus" by shooting him in the leg.