Here is the full list of all 50 Spec Ops: The Line achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
You are relieved.
Choose vengeance.
Kill 150 enemies with any heavy weapon. (campaign only)
Follow your orders.
Show mercy.
Play it loose.
Recover all Intel Items.
Blow up 10 explosive objects, killing at least one enemy each time. (campaign only)
Complete three chapters in a row without being killed or reloading a checkpoint.
Kill 75 enemies with any shotgun. (campaign only)
Kill 4 enemies with a shotgun in 10 seconds or less. (campaign only)
Complete any chapter with 60%+ accuracy without dying or reloading a checkpoint.
Kill 50 enemies using only the Attack Command. (campaign only)
Kill an oryx. (campaign only)
Live and let live.
Live and let die.
Complete game on "Walk on the Beach" difficulty.
Complete game on "Combat Op" difficulty.
Carry on, soldier.
The end of the line.
Choose restraint.
Kill an Edged Weapon Expert while he is up to 5 meters away. (campaign only)
Kill 50 enemies with any sniper rifle. (campaign only)
Kill 250 enemies with headshots. (campaign only)
Kill 100 enemies with any pistol or SMG. (campaign only)
Get out of here!
Stun an enemy by dumping sand on their head. (campaign only)
Kill 50 enemies with grenades. (campaign only)
Hit 10 enemies with your melee attack. (campaign only)
Stand united.
Kill 5 enemies using blind fire. (campaign only)
Save a bullet.
Kill 350 enemies with any rifle. (campaign only)
Recover 12 Intel Items.
Sprint into cover 10 times while under fire. (campaign only)
Buck the chain of command.
Play it smart.
Face the horrors of war.
Kill an enemy by tagging him with a sticky grenade. (campaign only)
Engineer an exit strategy.
We have contact.
Look out below.
Kill 3 enemies with a single grenade. (campaign only)
What's lost is found.
Recover one Intel Item.
Complete game on "Suicide Mission" difficulty.
Complete game on "FUBAR" difficulty.
Kill an enemy just as they are throwing a grenade. (campaign only)
Kill 10 enemies while they use zip lines or are rappelling. (campaign only)
Kick an enemy by vaulting over a cover. (campaign only)