Complete the following achievements to unlock Microsoft Gamerscore points.
| Unlockable: | How to Unlock: |
| "Radiation Levels Detected"(5 points): | Get throughthe toxic tunnel under City 17 in Half-Life 2. |
| Acid Reflex (5 points): | Kill an acid antlion worker. |
| Anchor's Aweigh! (5 points): | Get the airboat. |
| Aperture Science (40 points): | Earn gold medals on all Portal challenges. |
| Atomizer (10 points): | Disintegrate 15 soldiers by throwing them
into a Combine ball field. |
| Attica! (5 points): | Destroy the gunship in the hospital attic. |
| Barnacle Bowling (5 points): | Kill five barnacles with one barrel. |
| Basic Science (10 points): | Earn bronze medals on all Portal challenges. |
| Blast from the Past (10 points): | Find the HEV Suit Charger faceplate
in Eli's scrapyard. |
| Bone Breaker (5 points): | Kill 30 enemies with thrown physics objects. |
| Bug Hunt (10 points): | Use the antlions to kill 50 enemies. |
| Cache Checker (10 points): | Find every radar cache in chapter Under
The Radar. |
| Camera Shy (5 points): | Detach security cameras from the walls. |
| Car Crusher (5 points): | Use the cars to squash 15 antlions in
Episode One. |
| Citizen Escort (15 points): | Don't let any citizens die when escorting
them to the escape train. |
| Conservationist (5 points): | Kill five enemies with the same energy
ball. |
| Containment (5 points): | Contain the Citadel core. |
| Counter-Sniper (5 points): | Kill all of the snipers in City 17. |
| Cupcake (10 points): | Beat two Portal advanced maps. |
| Deadly Harvest (5 points): | Kill an enemy by planting a hopper
mine. |
| Dynasty (10 points): | Win 20 games. |
| Elevator Action (10 points): | Survive long enough to get on the
parking garage elevator. |
| Escape From City 17 (20 points): | Escape City 17 with Alyx. |
| Fight the Power (10 points): | Shut down the supression device by
disabling its generators. |
| Flamethrower (5 points): | Set five enemies on fire in 30 seconds. |
| Flushed (5 points): | Kill an enemy with a toilet. |
| Follow Freeman (10 points): | Gain command of a squad of rebels
in the uprising. |
| Fratricide (5 points): | Do whatever it takes to survive. |
| Friendly Fire (5 points): | Knock down a turret with another turret. |
| Fruitcake (20 points): | Beat four Portal advanced maps. |
| Get Some Grub (20 points): | Squish every antlion grub in Episode
Two. |
| Giant Killer (10 points): | Survive the rooftop strider battle in
the ruins of City 17. |
| Gordon Propelled Rocket (5 points): | Unlock the rocket launcher
lambda cache in chapter Under The Radar. |
| Grave Robber (5 points): | Steal a Zombine's grenade. |
| Grey Matter (5 points): | Get 25 headshots as a Sniper. |
| Hack Attack! (5 points): | Kill five enemies with a Manhack. |
| Hard to Kill (10 points): | Get five kills in a row without dying. |
| Hardcore (15 points): | Accumulate 1000 total kills. |
| Head of the Class (5 points): | Play a complete round with every
class. |
| Heartbreaker (10 points): | Complete Portal. |
| Heavy Weapons (5 points): | Get the airboat's mounted gun. |
| Hit and Run (5 points): | Run over 20 enemies with the car in Episode
Two. |
| Hot PotatOwned (10 points): | Kill a Combine soldier with his own
grenade. |
| Impenetrable Defense (10 points): | Successfully defend Dustbowl
without giving up a capture. |
| Impossible Defense (30 points): | Successfully defend Gravel Pit
without giving up a capture. |
| Into the Breach (5 points): | Help Griggs and Sheckley hold off
the antlion invasion inside the mine shaft. |
| Keep Off the Sand! (20 points): | Cross the antlion beach in chapter
Sandtraps without touching the sand. |
| Lab Rat (5 points): | Acquire the fully powered Aperture Science
Handheld Portal Device. |
| Lambda Locator (15 points): | Find all lambda caches in Half-Life2. |
| Lightning Offense (10 points): | Win Well in 5 minutes or less. |
| Little Rocket Man (30 points): | Send the garden gnome into space. |
| Live Bait (10 points): | Help Alyx snipe 30 enemies in Episode One. |
| Long Jump (5 points): | Jump 300 feet. |
| Malcontent (5 points): | Escape the apartment block raid. |
| Master of Disguise (15 points): | Trick an opposing medic into healing
you. |
| Neighborhood Watch (35 points): | Save all buildings outside the
missile silo from destruction. |
| Nemesis (5 points): | Get five revenge kills. |
| One Man Army (5 points): | Destroy six gunships in Half-Life2. |
| OSHA Violation (5 points): | Kill 3 enemies using the crane. |
| Pacifist (10 points): | Contain the Citadel core without killing
any stalkers. |
| Partygoer (5 points): | Make the correct party escort submission
position decision. |
| Payback (10 points): | Kill a Hunter with its own flechettes. |
| Pedal to the Metal (5 points): | Beat DOG in a race to the White
Forest base. |
| Pinata Party (5 points): | Find and break every web cache in Episode
Two. |
| Plaza Defender (10 points): | Survive the generator plaza standoff
in chapter Anticitizen One. |
| Powerhouse Offense (5 points): | Win 2Fort with a shutout. |
| Puttin' On a Clinic (15 points): | Defeat the chopper in Episode
Two without any misses. |
| Relentless Offense (20 points): | Win Hydro without giving up a
capture. |
| Revenge! (10 points): | Destroy the hunter-chopper in Half-Life2. |
| Rocket Science (20 points): | Earn silver medals on all Portal challenges. |
| Targetted Advertising (5 points): | Pin a soldier to the billboard
in chapter Highway 17. |
| Team Doctor (5 points): | Accumulate 25000 heal points as a Medic. |
| Terminal Velocity (5 points): | Fall 30,000 feet. |
| The One Free Bullet (40 points): | Beat Episode One firing exactly
one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!. |
| Think Fast! (10 points): | Kill an Elite Soldier with his own energy
ball. |
| Trusty Hardware (5 points): | Get the crowbar. |
| Turret (5 points): | Accumulate 10 turret kills with a single turret. |
| Two Points (2 points): | Use DOG's ball to make a basket in Eli's
scrapyard. |
| Vanilla Crazy Cake (30 points): | Beat all six Portal advanced maps. |
| Vorticough (13 points): | Discover the hidden singing vortigaunt
cave in chapter Water Hazard. |
| Warden Freeman (10 points): | Survive the second turret standoff
in Nova Prospekt. |
| Watch Your Head! (5 points): | Make it to the bottom of the Citadel's
main elevator shaft in one piece. |
| What cat? (5 points): | Break the mini-teleporter in Kleiner's lab. |
| With Friends Like these.. (10 points): | Play in a game with seven
or more players from your friends list. |
| World Traveler (5 points): | Play a complete game on every map. |
| Zero-Point Energy (5 points): | Get the Gravity Gun in Black Mesa
East. |
| Zombie Chopper (25 points): | Play through Ravenholm using only
the Gravity Gun. |
| Zombie-que (5 points): | Use flares to light 15 zombies on fire. |
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