No missable achievements (plus 50 unknown)
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Infiltrate a cargo ship.
Kill the power.
Kill 4 enemies in a row with headshots in the single player campaign.
Protect 'War Pig', the Abrams tank.
Save Pvt. Roycewicz on the stairs.
Operate an AC-130 gun ship.
Kill 5 enemies with one shot while in the AC-130 gunship.
Kill 20 enemies with explosives in a single level.
Kill 2 enemies by blowing up a car in the single player campaign.
Kill an enemy while blinded by a flashbang in the single player campaign.
Find Al-Asad's safehouse.
Kill at least 3 rappelling enemies in a single rope.
Survive a dog attack.
Carry Cpt. MacMillan to safety.
Corner Zakhaev's Son.
Complete the game on any difficulty.
Save the farmer.
Stab an injured crawling enemy.
Kill all 4 tanks on the overpass with the Javelin missile in 'The Bog'.
Complete 'All Ghillied Up' without alerting any enemies.
Complete the cargo ship mockup in less than 19 seconds.
Complete 'Crew Expendable' on Veteran difficulty.
Find 15 enemy intel items.
Shoot down an enemy helicopter with an RPG in the single player campaign.
Complete 'Blackout' on Veteran difficulty.
Kill 3 enemies in a row with your knife in the single player campaign.
Complete 'Charlie Don't Surf' on Veteran difficulty.
Complete the game on Hardened or Veteran difficulty.
Complete 'Hunted' and 'Death From Above' on Veteran difficulty.
Complete 'The Bog' and 'War Pig' on Veteran difficulty.
Complete 'Shock and Awe' on Veteran difficulty.
Complete 'Safehouse' on Veteran difficulty.
Find the Desert Eagle in 'Crew Expendable' and kill 5 enemies with it.
Complete 'All Ghillied Up' and 'One Shot, One Kill' on Veteran difficulty.
Get a kill with each type of handheld gun, explosive and launcher in the single player campaign.
Complete 'Heat' and 'The Sins of the Father' on Veteran difficulty.
Complete any level without reloading your weapon (excluding 'The Coup' and 'Aftermath').
Find and use the hidden cache in 'Heat'.
Complete 'Game Over' on Veteran difficulty.
Find 30 enemy intel items.
Complete 'Ultimatum', 'All In', and 'No Fighting in the War Room' on Veteran difficulty.
Alert the enemy helicopter in 'All Ghillied Up' and take it down.
Beat IW best time on the Ship Training course in 'F.N.G.' (15.1 sec).
Complete any level using only the knife to kill enemies.
Destroy all the TVs showing Al-Asad's speech.
Destroy 8 enemy helicopters in 'Heat'.
Kill 20 attack dogs with a knife.
Sky dive to safety on Veteran difficulty.