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