All Working The Orange Box Cheats - Xbox 360

Restore Health (Half-Life 2)
Enter the code while playing Half Life 2. No specific requirements other then the game. Can be entered at any time on any level.

[Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [B], [Button], [A] - Restore Health By 25 Points

Full Ammo (Half-Life 2)
If you're in need of ammunition for your currently-equipped weapon during any Half-Life 2 episode, enter the following code to max out your ammunition: [Y], [B], [A], [X], [Right Bumper], [Y], [X], [A], [B], [Right Bumper].

Invincibility (Half-Life 2)
Press the following buttons to become invincible: [Left Shoulder], [Up], [Right Shoulder], [Up], [Left Shoulder], [Left Shoulder], [Up], [Right Shoulder], [Right Shoulder], [Up]

Achievements
Complete each achievement to get the allotted gamerscore:

"Radiation Levels Detected" (5) - Get through the toxic tunnel under City 17 in Half-Life 2.
Acid Reflex (5) - Kill an acid antlion worker.
Anchor's Aweigh! (5) - Get the airboat.
Aperture Science (40) - Earn gold medals on all Portal challenges.
Atomizer (10) - Disintegrate 15 soldiers by throwing them into a Combine ball field.
Attica! (5) - Destroy the gunship in the hospital attic.
Barnacle Bowling (5) - Kill five barnacles with one barrel.
Basic Science (10) - Earn bronze medals on all Portal challenges.
Blast from the Past (10) - Find the HEV Suit Charger faceplate in Eli's scrapyard.
Bone Breaker (5) - Kill 30 enemies with thrown physics objects.
Bug Hunt (10) - Use the antlions to kill 50 enemies.
Cache Checker (10) - Find every radar cache in chapter Under The Radar.
Camera Shy (5) - Detach security cameras from the walls.
Car Crusher (5) - Use the cars to squash 15 antlions in Episode One.
Citizen Escort (15) - Don't let any citizens die when escorting them to the escape train.
Conservationist (5) - Kill five enemies with the same energy ball.
Containment (5) - Contain the Citadel core.
Counter-Sniper (5) - Kill all of the snipers in City 17.
Cupcake (10) - Beat two Portal advanced maps.
Deadly Harvest (5) - Kill an enemy by planting a hopper mine.
Dynasty (10) - Win 20 games.
Elevator Action (10) - Survive long enough to get on the parking garage elevator.
Escape From City 17 (20) - Escape City 17 with Alyx.
Fight the Power (10) - Shut down the supression device by disabling its generators.
Flamethrower (5) - Set five enemies on fire in 30 seconds.
Flushed (5) - Kill an enemy with a toilet.
Follow Freeman (10) - Gain command of a squad of rebels in the uprising.
Fratricide (5) - Do whatever it takes to survive.
Friendly Fire (5) - Knock down a turret with another turret.
Fruitcake (20) - Beat four Portal advanced maps.
Get Some Grub (20) - Squish every antlion grub in Episode Two.
Giant Killer (10) - Survive the rooftop strider battle in the ruins of City 17.
Gordon Propelled Rocket (5) - Unlock the rocket launcher lambda cache in chapter Under The Radar.
Grave Robber (5) - Steal a Zombine's grenade.
Grey Matter (5) - Get 25 headshots as a Sniper.
Hack Attack! (5) - Kill five enemies with a Manhack.
Hard to Kill (10) - Get five kills in a row without dying.
Hardcore (15) - Accumulate 1000 total kills.
Head of the Class (5) - Play a complete round with every class.
Heartbreaker (10) - Complete Portal.
Heavy Weapons (5) - Get the airboat's mounted gun.
Hit and Run (5) - Run over 20 enemies with the car in Episode Two.
Hot PotatOwned (10) - Kill a Combine soldier with his own grenade.
Impenetrable Defense (10) - Successfully defend Dustbowl without giving up a capture.
Impossible Defense (30) - Successfully defend Gravel Pit without giving up a capture.
Into the Breach (5) - Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Keep Off the Sand! (20) - Cross the antlion beach in chapter Sandtraps without touching the sand.
Lab Rat (5) - Acquire the fully powered Aperture Science Handheld Portal Device.
Lambda Locator (15) - Find all lambda caches in Half-Life 2.
Lightning Offense (10) - Win Well in 5 minutes or less.
Little Rocket Man (30) - Send the garden gnome into space.
Live Bait (10) - Help Alyx snipe 30 enemies in Episode One.
Long Jump (5) - Jump 300 feet.
Malcontent (5) - Escape the apartment block raid.
Master of Disguise (15) - Trick an opposing medic into healing you.
Neighborhood Watch (35) - Save all buildings outside the missile silo from destruction.
Nemesis (5) - Get five revenge kills.
One Man Army (5) - Destroy six gunships in Half-Life 2.
OSHA Violation (5) - Kill 3 enemies using the crane.
Pacifist (10) - Contain the Citadel core without killing any stalkers.
Partygoer (5) - Make the correct party escort submission position decision.
Payback (10) - Kill a Hunter with its own flechettes.
Pedal to the Metal (5) - Beat DOG in a race to the White Forest base.
Pinata Party (5) - Find and break every web cache in Episode Two.
Plaza Defender (10) - Survive the generator plaza standoff in chapter Anticitizen One.
Powerhouse Offense (5) - Win 2Fort with a shutout.
Puttin' On a Clinic (15) - Defeat the chopper in Episode Two without any misses.
Relentless Offense (20) - Win Hydro without giving up a capture.
Revenge! (10) - Destroy the hunter-chopper in Half-Life 2.
Rocket Science (20) - Earn silver medals on all Portal challenges.
Targetted Advertising (5) - Pin a soldier to the billboard in chapter Highway 17.
Team Doctor (5) - Accumulate 25000 heal points as a Medic.
Terminal Velocity (5) - Fall 30,000 feet.
The One Free Bullet (40) - Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
Think Fast! (10) - Kill an Elite Soldier with his own energy ball.
Trusty Hardware (5) - Get the crowbar.
Turret (5) - Accumulate 10 turret kills with a single turret.
Two Points (2) - Use DOG's ball to make a basket in Eli's scrapyard.
Vanilla Crazy Cake (30) - Beat all six Portal advanced maps.
Vorticough (13) - Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Warden Freeman (10) - Survive the second turret standoff in Nova Prospekt.
Watch Your Head! (5) - Make it to the bottom of the Citadel's main elevator shaft in one piece.
What cat? (5) - Break the mini-teleporter in Kleiner's lab.
With Friends Like these... (10) - Play in a game with seven or more players from your friends list.
World Traveler (5) - Play a complete game on every map.
Zero-Point Energy (5) - Get the Gravity Gun in Black Mesa East.
Zombie Chopper (25) - Play through Ravenholm using only the Gravity Gun.
Zombie-que (5) - Use flares to light 15 zombies on fire.

Alternate Title Screen (Portal)
Complete the game to unlock alternate title screen.

Hidden Left 4 Dead trailer
To get a trailer for the upcoming Valve game Left 4 Dead, wait at the game select screen (the one where you choose between Portal, Team Fortress, or Halflife 2). After a few minutes You will be taken to a demo video of the three orange box games. Wait for the video to end, then wait again. The next time the video comes up, it will be a Left 4 Dead trailer.