Complete Act 2

Kill all enemy snipers in Sniper Alley without being hit ("Ghosts of Sarajevo")

Kill Major Vladic ("And Justice For All")

Complete Act 1

Kill all enemies in the beach houses without causing an alarm ("Leave No Man Behind")

Kill 15 enemies with a stealth kill

Take a successful shot from a distance of 1 km or greater

Complete "Last Rites"

Complete the third interrogation

Complete any single player mission without using med kits, but taking damage

Complete the second interrogation

Kill 25 enemies using thermal or night vision goggles