This is a cumulative achievement, so you don't need to do it in one play-through, which would be quite hard, since corruption increases sometime since you can't fight all missions.
Also, all missions where you fight or deploy (simulate) count. I unlocked the achievement after deploying.
So, basically just keep playing games and if you want to get this quickly, prioritize the missions where you can deploy team members. I also recommend doing it in a godlike play-through since you earn more rewards per mission.