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Escape the apartment block raid.
Get the crowbar.
Get the airboat.
Get the airboat's mounted gun.
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Destroy the hunter-chopper in Half-Life 2.
Get the Gravity Gun in Black Mesa East.
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Kill five barnacles with one barrel.
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Use the antlions to kill 50 enemies.
Survive the second turret standoff in Nova Prospekt.
Gain command of a squad of rebels in the uprising.
Get through the toxic tunnel under City 17 in Half-Life 2.
Survive the generator plaza standoff in chapter Anticitizen One.
Shut down the supression device by disabling its generators.
Destroy six gunships in Half-Life 2.
Survive the rooftop strider battle in the ruins of City 17.
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Kill 3 enemies using the crane.
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Pin a soldier to the billboard in chapter Highway 17.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Break the mini-teleporter in Kleiner's lab.
Kill all of the snipers in City 17.
Use DOG's ball to make a basket in Eli's scrapyard.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space. If you did not also receive the achievement 'Manufacturing Ascent', Newell has abandoned his plans to shoot Noam Chomsky into space.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Contain the Citadel core.
Kill an enemy with a toilet.
Play through Ravenholm using only the Gravity Gun.
Kill five enemies with a Manhack.
Kill an acid antlion worker.
Survive long enough to get on the parking garage elevator.
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Destroy the gunship in the hospital attic.
Escape City 17 with Alyx.
Defeat both antlion guards outside the White Forest.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Survive the Hunter ambush with Alyx.
Survive the ambush at White Forest Inn.
Destroy the Combine Autogun in the junkyard.
Kill an enemy by planting a hopper mine.
Secure the launch doors on missile silo 2.
Save the missile silo from the Combine offensive.
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Don't let any citizens die when escorting them to the escape train.
Find all lambda caches in Half-Life 2.
Beat DOG in a race to the White Forest base.
Find every radar cache in chapter Under The Radar.
Steal a Zombine's grenade.
Kill an Elite Soldier with his own energy ball.
Help Alyx snipe 30 enemies in Episode One.
Run over 20 enemies with the car in Episode Two.
Kill 30 enemies with thrown physics objects.
Use the cars to squash 15 antlions in Episode One.
Kill a Hunter with its own flechettes.
Contain the Citadel core without killing any stalkers.
Find and break every web cache in Episode Two.
Kill five enemies with the same energy ball.
Defeat the chopper in Episode Two without any misses.
Kill a Combine soldier with his own grenade.
Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Send the garden gnome into space.
Use flares to light 15 zombies on fire.
Save all buildings outside the missile silo from destruction.
Squish every antlion grub in Episode Two.