Here is the full list of all 51 Alpha Protocol trophies - there are 39 bronze, 9 silver, 2 gold and 1 platinum.
Earn All Trophies
Let your gun do the talking.
Complete the game without being seduced.
Provoke Marburg into a fatal duel.
Romance all the ladies in Alpha Protocol in a single career.
Alienate "secret agent" Steven Heck.
Acquire the vast majority of Intel available in the game.
Gain Marburg's respect and best him in combat.
Romance Madison.
Kill Surkov for lying to you.
Have 100 placed devices detonate.
Complete Alpha Protocol using the Recruit background.
Reconcile with Alpha Protocol and stop Halbech.
Prevent a riot from killing hundreds in Taipei.
Score 100 Critical Hits with the Shotgun.
Complete 5 missions wherein 6 different gadgets are used.
Complete 3 missions with less than 5 kills and with no enemies alerted to your presence.
Get 3 people to hate you (who must all hate you at the same time).
Stop the plot to destroy the Roman History Museum.
Eliminate Konstantin Brayko.
Achieve the maximum SMG Critical Hit Multiplier 7 times in your career.
Across 90 dialogue choices, you've used each stance at least 25% of the time.
Assassinate Sheikh Shaheed.
Score 100 head shots with the Assault Rifle.
Complete the Training Mission.
Put an end to Halbech and Alpha Protocol.
Turn all your enemies into allies in one single career.
Complete Alpha Protocol on Hard difficulty setting.
Refrain from killing in cold blood.
Join Halbech and stop Alpha Protocol.
Complete Alpha Protocol.
Discover the identity of Sung's assassin.
"Romance" SIE.
Romance Scarlet.
Romance Mina.
Complete Operation True Heirs.
Prevent the assassination of President Ronald Sung.
Complete Operation Deus Vult.
Save Madison Saint-James from certain death.
Score 100 Critical Hits with the Pistol.
Forge a Partnership with Sergei Surkov.
Bypass 20 electronic devices.
Complete Operation Blood Feud.
Spare Konstantin Brayko.
Hack 10 computers.
Complete Operation Desert Spear.
Gain Liked reputation status of 3 people (who must all Like you at the same time).
Allow Shaheed to Live.
Pick 10 locks.
You Evaded (or defeated via Takedown moves) 75 enemies.
Defeat 50 enemies with CQC.