"Crowd Control" - Use one grenade to kill 5 enemies. "Cap One" - Get 500 headshots in campaign. "Stick It To 'Em" - Stick 50 Enemies in campaign. "When In Doubt, Run" - Finish a mission on Legendary without using any grenades/health packs. "Finish Him" - Assassinate 50 enemies in Campaign. "Why Me?" - Complete All Missions within 25 minutes. (Normal, Heroic, Legendary) "Blame Stosh" - Get an Assassination on a Cheiftan. "Bird's Eye View" - Destroy 25 Enemy Banshees in Campaign (Normal, Heroic, Legendary) "Ascending Into Hell" - Finish the First Mission. (Normal, Heroic, Legendary) "Fight To The Finish" - Finish round 50 in FireFight