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