Alpha Protocol Cheats

SMG Havoc (5): Achieve the maximum SMG Critical Hit Multiplier 7 times in your career.
Shotgun Crowd Control (5): Score 100 Critical Hits with the Shotgun.
Assault Rifle Marksmanship (5): Score 100 head shots with the Assault Rifle.
Black Belt (5): Defeat 50 enemies with CQC.
Lurker (5): Evade or Takedown 75 enemies across your career.
One With The Shadows (5): Complete 3 missions with less than 5 kills and with no enemies alerted to your presence.
Technophile (5): Complete 5 missions wherein 6 different gadgets are used.
Building a Deadlier Mousetrap (5): Have 100 placed devices detonate.
Breaking and Entering (5): Pick 10 locks.
Circuit Breaker (5): Bypass 20 electronic devices.
Data Theft (5): Hack 10 computers.
Friends Before Strangers (25): You saved Madison Saint James from certain death.
Hard Choices (25): The Roman History Museum is safe, thanks to your efforts.
Keeping the Peace (25): You prevented a riot from killing hundreds in Taipei.
Secret Service (25): You prevented the assassination of President Ronald Sung.
Stay of Execution (25): You allowed Sheikh Shaheed to live.
No Compromise, No Mercy (25): Choosing your own path, you put an end to Halbech and Alpha Protocol.
Savage Love (5): You gained the affection of SIE and allowed her to consummate her lust.
Exclusive Interview (5): You and Scarlet Lake had a romantic trist.
Crime Buster (25): You reconciled with Alpha Protocol and put Halbech out of business.
Rising Star (25): You joined Halbech and put an end to Alpha Protocol.
Price For Lying (5): You killed Surkov for lying to you.
Russian Alliance (5): You forged a partnership with Sergei Surkov.
A Price On Mercy (25): You spared Konstantin Brayko.
One Less Gangster (25): Konstantin Brayko is dead by your hand.
Youth Trumps Experience (5): By carefully pushing his buttons, you provoked Marburg into fighting to the death.
Respected Enemies (5): You gained Marburg's respect and bested him in battle.
Never Trust A Sociopath (5): You successfully alienated "secret agent" Steven Heck.
A Plot Uncovered (5): You discovered the identity of Sung's assassin.
Office Romance (5): Your working relationship with Mina Tang turned into something more.
Rome-ance (5): You became more than friends with Madison Saint James.

Refill your endurance meter to full as much as you want
It seems the 360 version has a glitch that you can automatically refill your endurance meter to full. When you have taken Endurance damage. Just go in Inventory, go to Armor, and re-equip your armor (highlight armor and press A), giving yourself a full endurance bar.

Special weapons
By accomplishing certain tasks you can unlock special items in a play through.

Brayko's SMG's: Execute Brayko
Brayko's Stereo: Spare Brayko
Gold Plated Assault Rifle: Sneak up on Al Samad Lieutenant without any alarms being sounded
Gold Plated Sub Machinegun: Assassinate Brajka
Marburg's Pistol: Bait Marburg into fighting to the death in the museum
Omen's Shotgun: Execute Omen Deng