Here is the full list of all 51 Spec Ops: The Line trophies - there are 42 bronze, 5 silver, 3 gold and 1 platinum.
Unlock all Trophies.
Complete game on "FUBAR" difficulty.
You are relieved.
Choose restraint.
Follow your orders.
Play it smart.
Kill 10 enemies while they use zip lines or are rappelling. (campaign only)
Kill 50 enemies with any sniper rifle. (campaign only)
Save a bullet.
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 50 enemies with grenades. (campaign only)
Kill an oryx. (campaign only)
Kill 4 enemies with a shotgun in 10 seconds or less. (campaign only)
Live and let die.
Live and let live.
Complete game on "Suicide Mission" difficulty.
Complete game on "Combat Op" difficulty.
Complete game on "Walk on the Beach" difficulty.
Carry on, soldier.
The end of the line.
Recover all Intel Items.
Choose vengeance.
Kill 75 enemies with any shotgun. (campaign only)
Kill 350 enemies with any rifle. (campaign only)
Get out of here!
Kill an enemy by tagging him with a sticky grenade. (campaign only)
Kill 100 enemies with any pistol or SMG. (campaign only)
Stand united.
Kill 250 enemies with headshots. (campaign only)
Kick an enemy by vaulting over a cover. (campaign only)
Show mercy.
Kill 150 enemies with any heavy weapon. (campaign only)
Blow up 10 explosive objects, killing at least one enemy each time. (campaign only)
Kill an Edged Weapon Expert while he is up to 5 meters away. (campaign only)
Buck the chain of command.
Play it loose.
Recover 12 Intel Items.
Stun an enemy by dumping sand on their head. (campaign only)
Kill 50 enemies using only the Attack Command. (campaign only)
Face the horrors of war.
Hit 10 enemies with your melee attack. (campaign only)
Engineer an exit strategy.
Kill 3 enemies with a single grenade. (campaign only)
Sprint into cover 10 times while under fire. (campaign only)
Kill an enemy just as they are throwing a grenade. (campaign only)
We have contact.
Kill 5 enemies using blind fire. (campaign only)
Look out below.
What's lost is found.
Recover one Intel Item.