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