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.
Only use one cinder block and bring it to the end of 'Embedded'.
Kill all the enemies in the 'Embedded' field of dead bodies.
Stop three APCs with Hadir's sniper rifle.
Kill all enemies at the Church, Clocktower, and Pool without anyone calling for backup.
Shut off the power to 4 buildings in 'Going Dark'.
Get at least one kill with eight different weapons when completing 'Old Comrades'.
Burn 4 enemies with a single molotov.
Take down a flying helicopter with a molotov.
Crash a helicopter by shooting the pilot.
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.
Save Alpha 3-2 from being downed.
Kill at least one enemy while inside The Reading Place, Aural Chic, and both Subway undergrounds.
Never get hit by the sniper while escaping captivity.
Kill both soldiers with one shot in 'Hometown'.
Reach Barkov's lab entrance using only drone strikes.
Blow up 3 tripwires with explosives.
Kill an enemy with a direct hit from a smoke grenade.
Finish single player on any difficulty.
Spit on Barkov.
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'.
Do not injure any civilians in 'Piccadilly'.
Neutralize the 'Fog of War' machine gun with a frag grenade.