Mercenaries 2: World in Flames

After entering the first outpost for a faction there is an option to capture an outpost. Follow the GPS and eliminate most if not all of the VZ soldiers in the base. Once eliminated call in the back-up chopper and stand near the glowing spot. I found that if you wander away they stand there like morons and waste time. Once you get the 3, 4 or 5 guys required to capture the base. Go inside and talk to the contact and there will be another option to capture the next outpost. Repeat until you have captured all of the outposts for a faction. I believe the achievement unlocks after you get the last contacts business card.

This is easy just capture 4 bases for UP and you have the achievement!Clear each base out order in UP Strike Team and thats it!