There are 51 Trophies that can be earned in this title.

Bronze

Basic Training
Complete the Training Mission.

Desert Spear
Assassinate Sheikh Shaheed.

Ask Questions First, Shoot Later
Refrain from killing in cold blood.

Judge, Jury, and Executioner
Let your gun do the talking.

Ladies' Man
Romance all the ladies in Alpha Protocol in a single career.

No Time For Love
Complete the game without being seduced.

Hard to Read
Across 90 dialogue choices, you've used each stance at least 25% of the time.

Social Butterfly
Gain Liked reputation status of 3 people (who must all Like you at the same time).

Antisocial
Get 3 people to hate you (who must all hate you at the same time).

Ready For Anything
Acquire the vast majority of Intel available in the game.

Pistol Mastery
Score 100 Critical Hits with the Pistol.

SMG Havoc
Achieve the maximum SMG Critical Hit Multiplier 7 times in your career.

Shotgun Crowd Control
Score 100 Critical Hits with the Shotgun.

Assault Rifle Marksmanship
Score 100 head shots with the Assault Rifle.

Black Belt
Defeat 50 enemies with CQC.

Lurker
You Evaded (or defeated via Takedown moves) 75 enemies.

One With The Shadows
Complete 3 missions with less than 5 kills and with no enemies alerted to your presence.

Technophile
Complete 5 missions wherein 6 different gadgets are used.

Building a Deadlier Mousetrap
Have 100 placed devices detonate.

Breaking and Entering
Pick 10 locks.

Circuit Breaker
Bypass 20 electronic devices.

Data Theft
Hack 10 computers.

Silver

Alpha Protocol
Complete Operation Desert Spear.

Operation Blood Feud
Complete Operation Blood Feud.

Operation Deus Vult
Complete Operation Deus Vult.

Operation True Heirs
Complete Operation True Heirs.

Evolution of an Action Hero
Complete Alpha Protocol using the Recruit background.

Thorton, Inc.
Turn all of your enemies into allies in one single career.

Gold

Full Circle
Complete Alpha Protocol.

Hardcore
Complete Alpha Protocol on Hard difficulty setting.

Platinum

Platinum
Earn All Trophies.

20 Secret

http://www.ps3trophies.org/game/alpha-protocol/trophies/