Successfully complete the game to unlock the "Big Heads" and "Infinite Ammo" cheats in the "Options" menu.
Successfully complete the game to unlock the following costumes.
Civilian costume.
End costume.
Mall costume.
Light Armor costume.
Medium Armor costume.
Old school costume.
Upgrade a weapon until it has a very high aggro rating. It must be nearly 100% full. Note: Style upgrades such as Jigsaw and Pimp will add a lot of aggro.
You must win three consecutive games of rock paper scissors. To start a game, press Triangle while not in combat next to your partner. Use the D-pad to select rock, paper, or scissors.
Purchase and add any three homebrew upgrades to your weapon. Note: the Rusty Stock, Metal Plate, and Soda Can Silencer are recommended.
Take your time when entering a new area. There could be civilians around that you should protect, or there could be alternate paths that you and your partner can exploit.
Have a saved game file from the original Army Of Two to unlock the AS-KRI and Grand Pinger for purchase.
Complete the following tasks to unlock PlayStation 3 trophy rewards.
| Trophy | How to unlock
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| A Decent Animal (Bronze) | Complete Chapter 3 on any difficulty level.
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| A Steep Descent (Bronze) | Complete Chapter 2 on any difficulty level.
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| All Guns Blazing (Bronze) | Versus: Kill a player with every weapon, including special weapons, in public matches.
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| Attention Grabber (Bronze) | Allow your partner to snipe 5 guys while in mock surrender.
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| Better Than Gold (Platinum) | Earn all other trophies.
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| Big Game Hunting (Bronze) | Versus: Kill both members of a single partnership during a public match.
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| Bound For Life (Silver) | Versus: In a public match, survive an entire Extraction map without suffering a single death on your team.
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| Chaaaaarge! (Bronze) | Charge through 20 enemies.
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| Co-Op Sniper (Bronze) | Co-op snipe 5 enemies.
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| DIY PMC (Bronze) | Versus: Create a custom facemask online (www.armyoftwo.com) and wear it in a public match.
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| Death Dealer (Bronze) | Versus: Kill 10 players on a single map in a public match.
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| Emergency Room (Bronze) | Complete Chapter 4 on any difficulty level.
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| Fancy Meeting You Here (Bronze) | Versus: Invite a friend before joining a lobby to play a public match.
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| Fresh Meat (Bronze) | Versus: Revive your partner and perform a partner reload during the same public match.
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| Full Arsenal (Silver) | Collect all weapons and weapon parts.
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| Future Visions (Silver) | Unlock all potential futures.
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| Gone Shopping (Bronze) | Complete Chapter 5 on any difficulty level.
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| Grenadier (Bronze) | Kill 3 or more enemies with a single grenade.
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| Hardcore (Gold) | Complete the game on the hardest difficulty.
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| Hate Monger (Bronze) | Customize a primary weapon to high aggro.
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| Healer (Bronze) | Heal your partner 10 times.
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| Humanist (Silver) | Save every hostage.
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| In Synch (Bronze) | Kill two enemies with simultaneous quick draws while in co-op mock surrender.
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| Job Seeker (Bronze) | Versus: In public matches, kill a player with either the primary or secondary weapon from every weapon kit.
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| King Of The Hill (Silver) | Versus: Win a public match on every map in Co-op Deathmatch, Control and Warzone.
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| Loot and Pillage (Bronze) | Collect $1,000,000.
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| Meat Bag (Bronze) | Use 15 enemies as human shields.
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| Not So Bad After All (Bronze) | Tie up 15 enemy combatants instead of executing them.
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| Not What I Thought It Was (Bronze) | Complete Chapter 1 on any difficulty level.
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| Old Faithful (Bronze) | Kill 400 enemies with assault rifles, submachine guns or shotguns.
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| One Shot, One Kill (Bronze) | Kill 100 enemies with a sniper rifle.
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| Open Hand Slap! (Bronze) | Kill 50 enemies with a melee or bayonet.
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| Pistolier (Bronze) | Kill 150 enemies with pistols.
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| Power Couple (Bronze) | Versus: Earn the highest partnership score in a Co-op Deathmatch, Control or Warzone public match.
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| Pumpkin Patch (Bronze) | Shoot 2 enemies in the head with a single bullet.
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| Quick Draw (Bronze) | Kill 25 enemies with a quickdraw from mock surrender.
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| Softcore (Silver) | Complete half the game on hardest difficulty.
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| Survival Of The Fittest (Silver) | Versus: Complete all 16 rounds of an Extraction game in a public match.
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| Survivor? (Silver) | Complete the game on any difficulty level.
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| The Beast (Gold) | Kill 6,666 people in Campaign.
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| The Optimist (Bronze) | Make a positive coop morality choice.
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| The Pessimist (Bronze) | Make a negative coop choice.
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| The Truth Is Right Here (Bronze) | Listen to all of the radio broadcasts.
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| Total Fist Bump Deflation (Bronze) | Finish the game in a fractured friendship.
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| Total Fist Bump Destruction (Bronze) | Finish the game as best friends.
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| Touch Not A Cat But A Glove (Silver) | Shoot all Maneki Neko cats in the game.
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| Unbreakable (Silver) | Survive an entire level without needing to be revived on normal difficulty or above.
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You must beat the game at least once to unlock 2 out of 4 extra characters.