Here is the full list of all 34 Call of Duty Black Ops: Declassified trophies - there are 18 bronze, 11 silver, 4 gold and 1 platinum.
Kill 5 enemies by sticking Semtex to each one in any Operation.
Perform 10 head shots in a row in any Operation.
Complete all Time Trial missions on any difficulty.
Destroy 20 total cars in Operations mode.
Kill 3 enemies with Mortar Strike in ‘Air Traffic Control’ Operation.
Complete ‘Got Your Back’ Operation with only a handgun.
Complete ‘Escort Service’ Operation without reloading.
Kill all scientists with head shots in ‘Self Destructive’ Operation.
Plant C4 in less than 60 seconds in ‘Self Destructive’ Operation.
Kill 2 scientists with a single grenade in ‘Self Destructive’ Operation.
Complete ‘Active Measures’ Operation without using Night Vision Goggles.
Kill both bosses with head shots in ‘Hostile Takeover’ Operation.
Melee 5 enemies in a row in any Operation.
Knife 10 stacks of cocaine in ‘Hostile Takeover’ Operation.
Kill Torres with a melee attack in ‘Hostile Takeover’ Operation.
Complete all Operations on any difficulty.
Shoot 10 stacks of cocaine in ‘Hostile Takeover’ Operation.
Kill 4 enemies with a single grenade in any Operation.
Save all Analysts in ‘Air Traffic Control’ Operation.
Start Operations mode on any difficulty.
Earn all available Trophies for Call of Duty® Black Ops: Declassified.
Melee 100 total enemies in Operations mode.
Kill 10 enemies in less than 5 seconds in any Operation.
Kill 4 enemies who are stunned by a Flashbang Grenade in any Operation.
Kill 15 enemies with RPG in ‘Three Point Landing’ Operation.
Kill 10 enemies with Ballistic Knife melee attack in ‘Rocket's Red Glare’ Operation.
Complete ‘Rocket's Red Glare’ Operation without taking damage.
Perform 10 head shots with the .357 Magnum in ‘OPS M.I.A.’ Operation.
Kill 8 enemies with 4 or fewer bullets in ‘OPS M.I.A.’ Operation.
Complete ‘OPS M.I.A.’ Operation with 100% accuracy.
Survive to wave 13 in Hostiles mode.
Earn 3 stars in each Operation.
Earn 3 stars in each Time Trial mission.
Earn 3 stars in each Hostiles mission.