| Achievement | How to unlock |
| "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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