If you're going for the following achievement, you'll get this naturally:
The Cold Blooded achievement in Far Cry 2 worth 100 pointsSubvert all the main faction missions in Bowa-Seko - the Southern Territory Once you subvert a mission for the UFLL and APR, you'll unlock the achievement. All that's required to unlock it is that you work for each faction in at least one way, so subverting the opposite side's mission counts. If you subvert a UFLL mission, you'll have worked for the APR and if you subvert an APR mission, you'll have worked for the UFLL. So if you're working on your six Act 2 subversions, rest assured as this will come naturally.