Here is the full list of all 27 Call of Duty: Modern Warfare achievements.
Complete every single player mission on Veteran or Realism difficulty.
Complete all Special Operations missions.
Kill all enemies at the Church, Clocktower, and Pool without anyone calling for backup.
Get at least one kill with eight different weapons when completing 'Old Comrades'.
Kill an enemy with a direct hit from a smoke grenade.
Take down a flying helicopter with a molotov.
Burn 4 enemies with a single molotov.
Kill both soldiers with one shot in 'Hometown'.
Kill at least one enemy while inside The Reading Place, Aural Chic, and both Subway undergrounds.
Kill all the enemies in the 'Embedded' field of dead bodies.
Complete 'The Wolf's Den' tunnels using only the 1911.
Blow up 3 tripwires with explosives.
Complete 'Clean House' without being hit using one bullet per threat.
Finish single player on any difficulty.
Reach Barkov's lab entrance using only drone strikes.
Shut off the power to 4 buildings in 'Going Dark'.
Kill 3 enemies while you are on a ladder.
Never get hit by the sniper while escaping captivity.
Spit on Barkov.
Stop three APCs with Hadir's sniper rifle.
Shoot the driver of the suicide truck.
Destroy 4 trucks with 4 drone strikes before they reach the end of their path in 'The Embassy'.
Save Alpha 3-2 from being downed.
Crash a helicopter by shooting the pilot.
Only use one cinder block and bring it to the end of 'Embedded'.
Do not injure any civilians in 'Piccadilly'.
Neutralize the 'Fog of War' machine gun with a frag grenade.