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