| 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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| - 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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- Bone Breaker ( 5 points )
| - 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 the Under The Radar chapter.
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| - Detach security cameras from the walls.
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| - 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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| - 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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- Flamethrower ( 5 points )
| - 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 in Portal.
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- Friendly Fire ( 5 points )
| - 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 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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| - 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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| - 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 )
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- Heavy Weapons ( 5 points )
| - Get the airboat's mounted gun.
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| - 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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| - 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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| - Help Alyx snipe 30 enemies in Half-Life 2 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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- 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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| - Contain the Citadel core without killing any stalkers.
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| - Make the correct party escort submission position decision in Portal.
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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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- 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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| - 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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| - 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 )
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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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