Portal: Portalgun ID 0:
While playing the game Press Up, Left, Down, Right, Up, Left, Down, Right, Y, Y.
Portal: Portalgun ID 1:
While playing the game Press Up, Left, Down, Right, Up, Left, Down, Right, X, X.
Portal: Portalgun ID 2:
While playing the game Press Up, Left, Down, Right, Up, Left, Down, Right, A, A.
Portal: Portalgun ID 3:
While playing the game Press Up, Left, Down, Right, Up, Left, Down, Right, B, B.
Portal: Portal placement anywhere:
While playing the game Press Y, A, B, A, B, Y, Y, A, Left, Right.
Portal: Upgrade Portalgun:
While playing the game Press X, B, LB, RB, Left, Right, LB, RB, LT, RT.
Portal: Fire energy ball:
While playing the game Press Up, Y, Y, X, X, A, A, B, B, Up.
Portal: Fire rocket projectile:
Press Up, Y, Y, B, B, A, A, X, X, Up.
Half-Life 2: Refill health:
While playing the game Press Up, Up, Down, Down, Left, Right, Left, Right, B,
A to restore 25 points of health.
Half-Life 2: Restore ammo:
While playing the game Press Y, B, A, X, RB, Y, X, A, B, RB.
Achievements:
Complete the following achievements to award the indicated amount
of Xbox Live Gamerscore points.
Zombie-que (5 gamerscore points):
Use flares to light 15 zombies on fire.
Zombie Chopper (25 gamerscore points):
Play through Ravenholm using only the Gravity Gun.
Zero-Point Energy (5 gamerscore points):
Find the Gravity Gun in Black Mesa East.
World Traveler (5 gamerscore points):
Play a complete game on every map.
With Friends Like these.. (10 gamerscore points):
Play in a game with at least 7 players from your friends list.
What cat? (5 gamerscore points):
Break the mini-teleporter in Kleiner's lab.
Watch Your Head! (5 gamerscore points):
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Warden Freeman (10 gamerscore points):
Survive the second turret standoff in Nova Prospekt.
Vorticough (13 gamerscore points):
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Vanilla Crazy Cake (30 gamerscore points):
Clear all six Portal advanced maps.
Two Points (2 gamerscore points):
Use DOG's ball to make a basket in Eli's scrapyard.
Turret (5 gamerscore points):
Acquire 10 turret kills with a single turret.
Trusty Hardware (5 gamerscore points):
Pick up the crowbar.
Think Fast! (10 gamerscore points):
Kill an Elite Soldier with his own energy ball.
The One Free Bullet (40 gamerscore points):
Clear Episode One firing exactly one bullet. Grenade, crowbar, rocket,
and Gravgun kills are accepted.
Terminal Velocity (5 gamerscore points):
Fall 30,000 feet.
Team Doctor (5 gamerscore points):
Accumulate 25000 heal points as a Medic.
Targetted Advertising (5 gamerscore points):
Pin a soldier to the billboard in chapter Highway 17.
Rocket Science (20 gamerscore points):
Win silver medals on all Portal challenges.
Revenge! (10 gamerscore points):
Blow up the hunter-chopper in Half-Life 2.
Relentless Offense (20 gamerscore points):
Win Hydro without giving up a capture.
Puttin' On a Clinic (15 gamerscore points):
Blow up the chopper in Episode Two without any misses.
Powerhouse Offense (5 gamerscore points):
Win 2Fort with a shutout.
Plaza Defender (10 gamerscore points):
Survive the generator plaza standoff in chapter Anticitizen One.
Pinata Party (5 gamerscore points):
Find and break every web cache in Episode Two.
Pedal to the Metal (5 gamerscore points):
Defeat DOG in a race to the White Forest base.
Payback (10 gamerscore points):
Kill a Hunter with its own flechettes.
Partygoer (5 gamerscore points):
Make the correct party escort submission position decision.
Pacifist (10 gamerscore points):
Contain the Citadel core without killing any stalkers.
OSHA Violation (5 gamerscore points):
Kill 3 enemies using the crane.
One Man Army (5 gamerscore points):
Blow up six gunships in Half-Life 2.
Nemesis (5 gamerscore points):
Perform 5 revenge kills.
Neighborhood Watch (35 gamerscore points):
Save all buildings outside the missile silo from destruction.
Master of Disguise (15 gamerscore points):
Trick an opposing medic into healing you.
Malcontent (5 gamerscore points):
Escape the apartment block raid.
Long Jump (5 gamerscore points):
Jump 300 feet.
Live Bait (10 gamerscore points):
Help Alyx snipe 30 enemies in Episode One.
Little Rocket Man (30 gamerscore points):
Send the garden gnome into space.
Lightning Offense (10 gamerscore points):
Win Well in 5 minutes or less.
Lambda Locator (15 gamerscore points):
Find all lambda caches in Half-Life 2.
Lab Rat (5 gamerscore points):
Acquire the fully powered Aperture Science Handheld Portal Device.
Keep Off the Sand! (20 gamerscore points):
Cross the antlion beach in chapter Sandtraps without touching the sand.
Into the Breach (5 gamerscore points):
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Impossible Defense (30 gamerscore points):
Defend Gravel Pit without giving up a capture.
Impenetrable Defense (10 gamerscore points):
Defend Dustbowl without giving up a capture.
Hot PotatOwned (10 gamerscore points):
Kill a Combine soldier with his own grenade.
Hit and Run (5 gamerscore points):
Run over 20 enemies with the car in Episode Two.
Heavy Weapons (5 gamerscore points):
Get the airboat's mounted gun.
Heartbreaker (10 gamerscore points):
Complete Portal.
Head of the Class (5 gamerscore points):
Play a complete round with every class.
Hardcore (15 gamerscore points):
Accumulate 1000 total kills.
Hard to Kill (10 gamerscore points):
Get 5 kills in a row without losing a life.
Hack Attack! (5 gamerscore points):
Kill 5 enemies with a Manhack.
Grey Matter (5 gamerscore points):
Perform 25 headshots as a Sniper.
Grave Robber (5 gamerscore points):
Steal a Zombine's grenade.
Gordon Propelled Rocket (5 gamerscore points):
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Giant Killer (10 gamerscore points):
Survive the rooftop strider battle in the ruins of City 17.
Get Some Grub (20 gamerscore points):
Squish every antlion grub in Episode Two.
Fruitcake (20 gamerscore points):
Beat four Portal advanced maps.
Friendly Fire (5 gamerscore points):
Knock down a turret with another turret.
Fratricide (5 gamerscore points):
Do whatever it takes to survive.
Follow Freeman (10 gamerscore points):
Gain command of a squad of rebels in the uprising.
Flushed (5 gamerscore points):
Kill an enemy with a toilet.
Flamethrower (5 gamerscore points):
Set 5 enemies on fire in 30 seconds.
Fight the Power (10 gamerscore points):
Shut down the supression device by disabling its generators.
Escape From City 17 (20 gamerscore points):
Escape City 17 with Alyx.
Elevator Action (10 gamerscore points):
Survive long enough to get on the parking garage elevator.
Dynasty (10 gamerscore points):
Win 20 games.
Defiant Achievement (5 gamerscore points):
At the beginning of Half-Life 2 where the carbine cop asks you to pick
up the can, pick it up and hit him with it.
Deadly Harvest (5 gamerscore points):
Kill an enemy by planting a hopper mine.
Cupcake (10 gamerscore points):
Beat two Portal advanced maps.
Counter-Sniper (5 gamerscore points):
Kill all of the snipers in City 17.
Containment (5 gamerscore points):
Contain the Citadel core.
Conservationist (5 gamerscore points):
Kill five enemies with the same energy ball.
Citizen Escort (15 gamerscore points):
Don't let any citizens die when escorting them to the escape train.
Car Crusher (5 gamerscore points):
Use the cars to squash 15 antlions in Episode One.
Camera Shy (5 gamerscore points):
Detach security cameras from the walls.
Cache Checker (10 gamerscore points):
Find every radar cache in chapter Under The Radar.
Bug Hunt (10 gamerscore points):
Use the antlions to kill 50 enemies.
Bone Breaker (5 gamerscore points):
Kill 30 enemies with thrown physics objects.
Blast from the Past (10 gamerscore points):
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Basic Science (10 gamerscore points):
Win bronze medals on all Portal challenges.
Barnacle Bowling (5 gamerscore points):
Kill 5 barnacles with one barrel.
Attica! (5 gamerscore points):
Blow up the gunship in the hospital attic.
Atomizer (10 gamerscore points):
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Aperture Science (40 gamerscore points):
Win gold medals on all Portal challenges.
Anchor's Aweigh! (5 gamerscore points):
Get the airboat.
Acid Reflex (5 gamerscore points):
Kill an acid antlion worker.
Radiation Levels Detected (5 gamerscore points):
Get through the toxic tunnel under City 17 in Half-Life 2.
