Completed Act 1
Completed Act 2
Completed the game on Casual
Completed the game on Medium
Completed the game on Expert
Collected all secrets in Act 1
Collected all secrets in Act 2
Collected all secrets in Act 3
Killed three or more enemies by shooting a grenade
Took 50 headshots in single player
Achieved 100% accuracy in any single player mission
Completed any single player mission without using med kits, but taking damage
Killed 30 enemies using your sidearm
Killed 15 enemies with a stealth kill
Killed 50 enemies while holding your breath
Killed 20 enemies from a distance of 600m or greater
Killed 25 enemies using thermal or night vision goggles
Killed Major Vladic ("And Justice For All")
Killed Maddox once and for all ("No Loose Ends")
In the final duel with Maddox, killed him with the first shot ("No Loose Ends")
Killed all enemy snipers in Sniper Alley without being hit ("Ghosts of Sarajevo")
Rescued the friendly ("From Out Of Nowhere")
Retrieved your weapon without being detected ("Burning Bridges")
Took a successful shot from a distance of 1 km or greater
Killed all enemies in the beach houses without causing an alarm ("Leave No Man Behind")
Completed any act without using medkits
Completed the Campaign using max one medkit per mission
Killed 25 opponents in multiplayer
Killed 50 opponents in multiplayer
Killed 100 opponents in multiplayer
Took 25 headshots in multiplayer
Took 50 headshots in multiplayer
Killed 10 opponents in multiplayer using your sidearm
Won 5 rounds in a row in Team Deathmatch
Won 10 Team Deathmatch rounds
Won 25 Team Deathmatch rounds
In one multiplayer round killed an opponent with a sniper rifle, sidearm and melee attack
Participated in any multiplayer match
Begun the hunt
Completed "Operation Siberian Strike"
Completed "It Takes Two"
Completed "Last Rites"
Got the train moving again
Completed the first interrogation
Completed the second interrogation
Completed the third interrogation
Sneaked through the underground storehouse undetected
Collected all secrets in Siberian Strike campaign