Unlock Trophies
A Steep Descent (Bronze) - Complete Chapter 2 on any difficulty level.
A Decent Animal (Bronze) - Complete Chapter 3 on any difficulty level.
Emergency Room (Bronze) - Complete Chapter 4 on any difficulty level.
Gone Shopping (Bronze) - Complete Chapter 5 on any difficulty level.
Meat Bag (Bronze) - Use 15 enemies as human shields.
Chaaaaarge! (Bronze) - Charge through 20 enemies.
Grenadier (Bronze) - Kill 3 or more enemies with a single grenade.
Pistolier (Bronze) - Kill 150 enemies with pistols.
Old Faithful (Bronze) - Kill 400 enemies with assault rifles, submachine guns or shutguns.
One Shot, One Kill (Bronze) - Kill 100 enemies with a sniper rifle.
Quick Draw (Bronze) - Kill 25 enemies with a quickdraw from mock surrender.
Open Hand Slap! (Bronze) - Kill 50 enemies with a melee or bayonet.
Not So Bad After All (Bronze) - Tie up 15 enemy combatants instead of executing them.
Healer (Bronze) - Heal your partner 10 times.
Co-Op Sniper (Bronze) - Co-op snipe 5 enemies.
Attention Grabber (Bronze) - Allow your partner to snipe 5 guys while in mock surrender.
In Synch (Bronze) - Kill two enemies with simultaneous quick draws while in co-op mock surrender.
Pumpkin Patch (Bronze) - Shoot 2 enemies in the head with a single bullet.
Not What I Thought It Was (Bronze) - Complete Chapter 1 on any difficulty level.
Fancy Meeting You Here: Versus (Bronze) - Invite a friend before joining a lobby to play a public match.
Big Game Hunting: Versus (Bronze) - Kill both members of a single partnership during a public match.
Job Seeker: Versus (Bronze) - In public matches, kill a player with either the primary or secondary weapon from every weapon kit.
DIY PMC: Versus (Bronze) - Create a custom facemask online (www.armyoftwo.com) and wear it in a public match.
Death Dealer: Versus (Bronze) - Kill 10 players on a single map in a public match.
Power Couple: Versus (Bronze) - Earn the highest partnership score in a Co-op Deathmatch, Control or Warzone public match.
All Guns Blazing: Versus (Bronze) - Kill a player with every weapon, including special weapons, in public matches.
Survivor? (Silver) - Complete the game on any difficulty level.
Softcore (Silver) - Complete half the game on hardest difficulty.
Unbreakable (Silver) - Survive an entire level without needing to be revived on normal difficulty or above.
Total Fist Bump Destruction (Bronze) - Finish the game as best friends.
Total Fist Bump Deflation (Bronze) - Finish the game in a fractured friendship.
The Truth Is Right Here (Bronze) - Listen to all of the radio broadcasts.
Loot and Pillage (Bronze) - Collect $1,000,000.
Hate Monger (Bronze) - Customize a primary weapon to high aggro.
The Optimist (Bronze) - Make a positive coop morality choice.
The Pessimist (Bronze) - Make a negative coop choice.
Fresh Meat: Versus (Bronze) - Revive your partner and perform a partner reload during the same public match.
Full Arsenal (Silver) - Collect all weapons and weapon parts.
Touch Not A Cat But A Glove (Silver) - Shoot all Maneki Neko cats in the game.
Humanist (Silver) - Save every hostage.
Future Visions (Silver) - Unlock all potential futures.
Bound For Life: Versus (Silver) - In a public match, survive an entire Extraction map without suffering a single death on your team.
King Of The Hill: Versus (Silver) - Win a public match on every map in Co-op Deathmatch, Control and Warzone.
Survival Of The Fittest: Versus (Silver) - Complete all 16 rounds of an Extraction game in a public match.
Hardcore (Gold) - Complete the game on the hardest difficulty.
The Beast (Gold) - Kill 6,666 people in Campaign.
Better Than Gold (Platinum) - Earn all other trophies.
Additionally, there are eight Chapters of Deceit DLC trophies:
Good Fellas (Bronze) - Negative morality choice. Choose to execute the woman.
Can It Really Be That Simple? (Bronze) - Kill the FDI leader. Could it really be this easy?
Men of the People (Bronze) - Escort all hostages to safety.
Paging Dr. Wu (Bronze) - Protect Dr. Wu from the FDI foes.
Good Guys (Bronze) - Positive morality choice. Choose to let the traitor live.
Hit And Miss (Silver) - Complete Chapter 8 on any difficulty level.
Pick A New Face (Bronze) - Find one new mask in The Chapters of Deceit.
Train Wrecked (Silver) - Complete chapter 9 on any difficulty level.
Unlock Cheats
Big Heads - Complete the campaign on Casual difficulty.
Infinite Ammo - Complete the campaign on Casual difficulty.
Unlock Additional Weapons and Items
When you first start the game it will check your devices for the first Army of Two game If it finds them you will get additional weapons and mods to use from the beginning (granted you reach the trash container at the start of chapter 1).
Unlock Skins
Civilian - Beating the game on any difficulty.
End - Beating the game on any difficulty.
Mall - Beating the game on any difficulty.
Medium Armor - Beating the game on any difficulty.
Old school - Beating the game on any difficulty.
Start Playing With Fullly Upgraded Weapons
Upgrade your weapons/buy new ones, then continue onwards till the cutscene with the moral choice, make it. Go back to the main menu during the cutscene with the explosions, select campaign, select the one you just did. Click new. You will have all the weapons, upgrades and money from the previous mission, and can upgrade your weapons once more. Repeat till all beginning weapons are upgraded/bought.