ACHIEVEMENT - HOW TO UNLOCK 4'S COMPANY - Play through an entire chapter with 4 player co-op. BALKAN PARTY - Complete chapter 1. BLANKET PARTY - Perform all grab moves, melee attacks and signature kills. BURMA BREAKOUT - Complete chapter 4. CHALLENGE JUNKIE - Complete all Challenges. DESERT STORM - Complete chapter 2. FLORENCE NIGHTINGALE - Heal 50 times. GUN SAFARI - Use each weapon in the game to kill an enemy. HANDS-ON - Kill 2000 enemies using melee attack or grabs. KILLING MACHINE - Kill 50 enemies in a single combo. KNOCK, KNOCK - Blow the factory gates!. MISSION ACCOMPLISHED - Complete the Campaign on Casual difficulty. PEAK PERFORMANCE - Upgrade 1 character completely. PROFESSIONAL WRESTLER - Perform all 4 fully upgraded grab moves. RAINING DOWN FIRE - Take out the weapons train. THE EXTRA MILE - Complete the Campaign on Hardcore difficulty. TIME IS MONEY - Complete a challenge. TOP CLASS CREW - Upgrade all characters and signature weapons. UNDER DURESS - Interrogate the sniper. UNTOUCHABLE - Complete a mission on Hardcore without getting healed. URBAN PACIFICATION - Complete chapter 3.