| Achievement | How to unlock
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- "Radiation Levels Detected"(5 points)
| - Get throughthe toxic tunnel under City 17 in Half-Life 2.
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| - Kill an acid antlion worker.
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- Anchor's Aweigh! (5 points)
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- Aperture Science (40 points)
| - Earn gold medals on all Portal challenges.
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| - Disintegrate 15 soldiers by throwing them into a Combine ball field.
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| - 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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| - Kill 30 enemies with thrown physics objects.
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| - Use the antlions to kill 50 enemies.
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- Cache Checker (10 points)
| - Find every radar cache in chapter Under The Radar.
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| - Detach security cameras from the walls.
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| - Use the cars to squash 15 antlions in 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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| - Contain the Citadel core.
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- Counter-Sniper (5 points)
| - Kill all of the snipers in City 17.
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| - 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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- 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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| - Set five enemies on fire in 30 seconds.
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| - 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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| - Do whatever it takes to survive.
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| - Knock down a turret with another turret.
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| - Beat four Portal advanced maps.
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- Get Some Grub (20 points)
| - Squish every antlion grub in Episode Two.
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| - 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 chapter Under The Radar.
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| - Steal a Zombine's grenade.
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| - Get 25 headshots as a Sniper.
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| - Kill five enemies with a Manhack.
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| - Get five kills in a row without dying.
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| - 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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| - Get the airboat's mounted gun.
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| - Run over 20 enemies with the car in 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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| - Acquire the fully powered Aperture Science Handheld Portal Device.
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- Lambda Locator (15 points)
| - Find all lambda caches in Half-Life2.
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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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| - Help Alyx snipe 30 enemies in Episode One.
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| - 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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| - Destroy six gunships in Half-Life2.
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- OSHA Violation (5 points)
| - Kill 3 enemies using the crane.
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| - Contain the Citadel core without killing any stalkers.
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| - Make the correct party escort submission position decision.
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| - 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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| - Find and break every web cache in 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 Episode Two without any misses.
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- Relentless Offense (20 points)
| - Win Hydro without giving up a capture.
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| - Destroy the hunter-chopper in Half-Life2.
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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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| - Accumulate 25000 heal points as a Medic.
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- Terminal Velocity (5 points)
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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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| - Kill an Elite Soldier with his own energy ball.
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- Trusty Hardware (5 points)
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| - Accumulate 10 turret kills with a single turret.
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| - 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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| - 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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| - 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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| - Use flares to light 15 zombies on fire.
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