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