Like and Subscribe! Call of Duty 4 : Modern Warfare Remastered Xbox Series X Mission 11 - All Ghillied Up - NO Stealth - NO CHEATS Mission 12 - One Shot One Kill Hardest Difficulty - Veteran Achievements Unlocked 29/50 Man Versus Machine - Alert the enemy helicopter in "All Ghillied Up" and take it down. Bird on the Ground - Shoot down an enemy helicopter with an RPG in the single player campaign. Three of a Kind - Kill 3 enemies in a row with your knife in the single player campaign. Challenges; Hardest difficulty "Veteran" All Intel NO aim assist NO crosshair