Castle level
Successfully complete the Subway level on the "Agent" difficulty setting with a time less than 2:15 to unlock the Castle multi-player level.
Team King Of The Hill level
Successfully complete the King's Ransom level on the "Agent" difficulty setting with a time less than 2:20 to unlock the Team King Of The Hill multi-player level.
Sky Rail level
Successfully complete the Cold Reception level on the "Secret Agent" difficulty setting with a time less than 3:15 to unlock the Sky Rail multi-player level.
Covert skins
Successfully complete the City Of Walkways level on the "Secret Agent" difficulty setting with a time less than 3:45.
Scientist skins
Successfully complete the Masquerade level on the "00 Agent" difficulty setting with a time less than 4:20.
Contemporary skins
Successfully complete the game on the "Agent" difficulty setting to unlock Alec Trevlyan (006), Wai Lin, Max Zorin, May Day, and Christmas Jones (dress).
Health at 100%
In the mission where you chase the female assassin (mission 3) Thames Chase, when you are defusing the bomb, stop the clock on exactly 0.07 seconds left and your health will be topped back up to 100%.
Classic Skins
Finish the game using Secret Agent difficulty to get new skins such as Odd Job, Scaramanga, Baron Semody, Jaws, Tuxedo Bond, and more.
Golden gun mode
Complete the game in 00agent to receive golden gun mode.
Navy Skins
To unlock Navy Skins in multiplayer,beat:A Sinking feeling on 00 agent in under 2:55
Suit Skins
Finish the Courier level with a time less than 2:00 using Secret Agent difficulty.
Unlock Skins
Finish the game using Agent difficulty to get new skins like May Day, Christmas Jones (Dress), Alec Trevlyan, Wai Lin, Max Zorin.
Change Gun Options
Hold B and press Z to change options on your gun. For example, you can make the Wolfram P2K have a silencer. Note: Every gun does something different.
Air Raid Scenario
Beat the Masquerade level on "Agent" difficulty in under 3:15.
Make your enemies surrender
To make your enemies surrender you must first find an enemy to work on. Once you have found an enemy, use the stuner on your watch to paralyze him. Stun the enemies from a medium distance until they drop the weapon they are holding. Than Quickly pull out a pistol or any non rapid firing weapon and shot them once in the foot. Stay close to the enemy or they will pull out a pistol and soot you. You can now do whateveryou want with them.
Live and Let Die
In the level "Night Watch" you may notice that whenever you try to shoot someone, you automatically fail the mission, the simple solution to this is to punch the people you want dead to death and you should'nt fail the mission.
Soldier Skins
Successfully complete the Midnight Departure level on the "Agent" difficulty setting with a time less than 3:05 to unlock the Soldier Skins.
Security Skins
You know all those security guards you sometimes see? Well if you complete 'King's Ransom' in Secret Agent difficulty in under 3:45 then you will unlock them.
Exotic Skins
Complete 'Cold Reception' in '00' agent difficulty in under 3:25 to get a exotic skins.
Submarine Level
Successfully complete the Submarine single player level on the 'Agent' difficulty setting with a time less than 2:30 to unlock the Submarine level.
Forest Level
Successfully complete the Night Watch single player level on the "00 Agent" difficulty setting with a time less than 2:20 to unlock the Forest multi-player level.
Capture the Briefcase level
Successfully complete the Turncoat single player level on the "Secret Agent" difficulty setting with a time less than 3:20 to unlock the Capture the Briefcase multi-player level.
Civilian Skins
Successfully complete the City Of Walkways 1 level on the "Agent" difficulty setting with a time less than 3:35.
Forest Scenario
Successfully complete the Night Watch single player level on the "00 Agent" difficulty setting with a time less than 2:20 to unlock the Forest multi-player scenario.