Complete the third interrogation
Complete any act without using medkits
Complete the game on Casual
Kill all enemy snipers in Sniper Alley without being hit ('Ghosts of Sarajevo')
Kill 25 enemies using thermal or night vision goggles
Collect all secrets in Act 2
Kill all enemies in the beach houses without causing an alarm ('Leave No Man Behind')
Collect all secrets in Act 3
Kill 30 enemies using your sidearm
Take 50 headshots in single player
Complete the second interrogation
Complete the game on Expert
Begin the hunt
Kill 20 enemies from a distance of 600m or greater
Complete the first interrogation
Complete Act 2
Kill 15 enemies with a stealth kill
Complete 'Operation Siberian Strike'
Collect all secrets in Act 1
Complete the game on Medium
In the final duel with Maddox, kill him with the first shot ('No Loose Ends')
Complete 'It Takes Two'
Achieve 100% accuracy in any single player mission
Complete the Campaign using max one medkit per mission
Kill 50 enemies while holding your breath
Kill Major Vladic ('And Justice For All')
Complete 'Last Rites'
Take a successful shot from a distance of 1 km or greater
Sneak through the underground storehouse undetected
Collect all secrets in Siberian Strike campaign
Complete Act 1
Kill three or more enemies by shooting a grenade
Rescue the friendly ('From Out Of Nowhere')
Get the train moving again
Retrieve your weapon without being detected ('Burning Bridges')
Complete any single player mission without using med kits, but taking damage
Kill Maddox once and for all ('No Loose Ends')