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