Complete the following achievements to unlock Xbox Live Gamerscore points.
Tattooed Millionaire (25 points): Earn $1 million.
Partners in Crime (50 points): Play co-op with a friend.
Pipeline (20 points): Capture all outposts for a single faction.
Eat the Heat (10 points): Try accelerating and braking at the same time.
Armaggedon It (20 points): Destroy 20 buildings.
Shoot to Thrill (20 points): Get 25 headshots.
Damage, Inc. (50 points): Use 20 airstrikes in co-op.
Hail and Kill (20 points): Destroy 50 objects using melee.
Holy Smoke (20 points): Destroy 50 objects with a grenade.
Little Savage (20 points): Destroy 50 objects with an RPG launcher.
Balls to the Wall (20 points): Beat the Winching Challenge three times.
Gone Shootin' (20 points): Complete one of Fiona's challenges.
Heavy Metal Thunder (10 points): Successfully complete 10 action hijacks.
Be Quick or Be Dead (10 points): Snipe 50 enemy vehicle drivers.
No More Mr. Nice Guy (10 points): Make all factions hostile.
...And Justice For All (50 points): Verify all high value targets.
Digital Man (20 points): Unlock all shop items.
We'll Burn the Sky (50 points): Unlock all landing zones.
Highway to Hell (10 points): Complete three different races.
Wheels of Steel (50 points): Come in first during a co-op race.
Nothin' But a Good Time (50 points): Destroy 200 objects from the gunner seat in co-op.
Everybody Wants Some!! (50 points): Play with a Mercenaries 2 developer or a player who already has this achievement.
Billion Dollar Babies (25 points): Earn $1 billion.
Additionally there are seventeen secret achievements.
Wild One (20 points): You recruited Ewan.
The Rage (20 points): You completed "Rescue Carmona".
Hello, Hooray (50 points): You acquired the PMC.
School's Out (20 points): You completed the tutorial.
Ride the Dragon (10 points): You hijacked the tank in the villa.
The Analog Kid (20 points): You recruited Misha.
Oil and Gasoline (20 points): You recruited Eva.
Runnin' with the Devil (20 points): You verified Blanco.
You Better Run (20 points): You verified Carmona.
No Compromise, No Regrets (20 points): You battled for Caracas.
The Hero and the Madman (50 points): You Completed Mercenaries 2.
Dirty Deeds (10 points): You achieved maximum Universal Petroleum mood.
Island of Domination (10 points): You achieved maximum Pirate mood.
Forever Free (10 points): You achieved maximum P.L.A.V. mood.
Longing For Fire (10 points): You achieved maximum Chinese mood.
Stand Up and Shout (10 points): You achieved maximum mood with the Allies.
Aces High (50 points): You captured all high value targets.
Complete the indicated task to unlock the corresponding equipment.
Ambassador gunship: Complete level 3 of the Helicopter Flying mission.
Diplomat heavy tank: Destroy the targeted buildings for the Allied Nations.
MOAB bomb: Complete all HVT missions for the Allied Nations.
To unlock alternate outfits for your mercenary, play the challenge games at the PMC from Fiona. There are a total of three costumes for each one character.
Complete any three challenges at level 3 to get the costumes in order. The Pistol challenge us the easiest to complete. Emplacement Weapons and Grenade Launcher challenges are about even, however Emplacement Weapons is perhaps slightly more difficult when you have to shoot the flying cars. The Sniper challenge is by far the most difficult to complete.
Easy Sniper challenge
Use R1 PlayStation3 or RB Xbox 360 and not the scope for it. Take out the drums next to the cars first then go the two statues for some extra time.
Winning challenges easily
Bet the maximum money for the level 1 and 2 challenges then save and reload the game until you win. Bet the minimum money for the level 3 challenge.
Easy transport and smuggling missions
Note: This trick only works after you obtain a helicopter pilot and the winch ability. When on a transport or smuggling contract that relies on you not tipping the vehicle and losing the objects inside, summon a helicopter before entering the mission assigned vehicle, as close to the vehicle as possible. Then, enter the mission vehicle. The timer should start. Get back out and take off in your helicopter. Use the winch to grab the mission vehicle and gain as much altitude as possible. If you fly relatively level, you will not lose anything. However even if you bank even slightly to get around obstacles, losses will be minimal as long as you do not actually bank the copter in a hard turn. The vehicle will get tossed about, making the copter harder to fly; but if you travel directly to the drop-off point from the beginning, it will keep its cargo. This helps you avoid nearly all ground forces. All you have to worry about are the anti-air guns and other helicopters. If worst comes to worst, simply drop the vehicle after coming down to about 20 feet or less. You will have already have saved enough time to hijack another helicopter.
When Carmona's men are attacking the PMC, after you destroy the tanks set a charge of C4 on the gates closer to the mansion and blow it. It should drop straight down and block the road leading out of the compound. Enter the mansion and trigger the intermission sequence. When you exit the building, the road leading out of the compound is still blocked. Kill Carmona's bodyguards and his jeep should be stuck on the rubble of the archway. Kill him and snap the picture for easy verification of Carmona.
When completing the mission on the oil rig in the water behind the PMC, kill Blanco and take his weapon, the hunting pistol. The hunting pistol is a very powerful weapon, often killing enemies in one shot. With the hunting pistol in your possession, continue through the "Finding Solano" mission/ After the encounter with Carmona inside the villa, he runs in a straight line directly away from you, giving you a clear shot at his back. If you miss on the first shot, he has a good bit of a jog until he reaches his jeep, giving you plenty of time to gun him down.
Getting 100% completion
Successfully complete all outpost missions before you initiate the final mission in story mode. The outpost missions can no longer be accessed after the game is completed, which will also prevent a faction's shop items from being unlocked.
After completing the first UP mission and receiving Ewan, talk to him about the Winch challenge. After completing level 3 on this challenge, bet the maximum amount of money. Even though you have already done this, the height does not raise. Therefore you can continue betting at the maximum amount. After about four times (depending on how much you start with), you should have about $7.0 million. You can continue from here in order to get the maximum wager amount to $5.0 million (when you have about $14.0 million in funds). From there you can repeat this as often as desired when you need money.
Note: To save time, if you are trying to use the above method to increase your money, use stackable items from outside of your stronghold. For example, try the gas canisters across the road (or for something less volatile, use the shipping containers directly across the lake behind your house). Items used from outside of your stronghold stay in the exact location you put them until you quit your game, giving you a prepared stack height the next time around. Two or three attempts may be required to gather the items, but it is well worth it, as once done it requires only seconds to win the challenge.
Stealing fuel without upsetting a faction
This is most useful when used with factions who are already hostile (to keep them from shooting you down), but can also be used to keep friendly factions from becoming upset with you. Obtain one of the helicopters used by the faction you want to steal from (or one of its allies), and allow your disguise to finish. Fly to the location of the fuel you want to obtain and lower your winch. Grab the fuel tank and lift off before the enemy soldiers recognize you, then fly to a secure location (either the PMC or a remote, open location). Once out of sight, call Ewan in for the pick-up. Note: Using a heavier helicopter is recommended, as the Rogue and Gunney class choppers are extremely difficult to control when carrying a heavy fuel tank. Also, there are at least half a dozen fuel tanks relatively close to the PMC, most of which are controlled by Universal Petroleum. Spending the fuel for an Ambassador Gunship (an Allied helicopter, who are allies with UP) is well worth it if you are going to use your PMC as a fuel depot.
Park a vehicle outside of a building which you can enter. Enter then exit the building. The vehicle will be repaired with full ammunition.
When you get the maximum betting level on the Winch challenge, keep going until you get to about $100.0 million. The minimum bet is now also $5 million. If you continue from that, the minimum will actually grow higher than the maximum and allow for even more money. However there is a catch; once you go beyond there is no way you can raise or lower the bet because it is higher than the maximum, but it is still the minimum.
Sniper rifle scope on regular rifle
Have a sniper rifle in your inventory. While you are using the scope, press D-pad Right to switch weapons. You should have an assault rifle out while having the scoped view.