Half-Life 2

Squish every antlion grub in Episode Two.

Save all buildings outside the missile silo from destruction.

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Use flares to light 15 zombies on fire.

Send the garden gnome into space.

Kill a Combine soldier with his own grenade.

Defeat the chopper in Episode Two without any misses.

Kill five enemies with the same energy ball.

Find and break every web cache in Episode Two.

Contain the Citadel core without killing any stalkers.

Kill a Hunter with its own flechettes.

Use the cars to squash 15 antlions in Episode One.

Kill 30 enemies with thrown physics objects.

Run over 20 enemies with the car in Episode Two.

Help Alyx snipe 30 enemies in Episode One.

Kill an Elite Soldier with his own energy ball.

Steal a Zombine's grenade.

Find every radar cache in chapter Under The Radar.

Beat DOG in a race to the White Forest base.

Find all lambda caches in Half-Life 2.

Don't let any citizens die when escorting them to the escape train.

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Save the missile silo from the Combine offensive.

Survive the ambush at White Forest Inn.

Secure the launch doors on missile silo 2.

Destroy the Combine Autogun in the junkyard.

Kill an enemy by planting a hopper mine.

Survive the Hunter ambush with Alyx.

Defeat both antlion guards outside the White Forest.

Cross the antlion beach in chapter Sandtraps without touching the sand.

Escape City 17 with Alyx.

Destroy the gunship in the hospital attic.

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.

Survive long enough to get on the parking garage elevator.

Kill an acid antlion worker.

Play through Ravenholm using only the Gravity Gun.

Kill five enemies with a Manhack.

Contain the Citadel core.

Kill an enemy with a toilet.

Make it to the bottom of the Citadel's main elevator shaft in one piece.

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

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.

Use DOG's ball to make a basket in Eli's scrapyard.

Kill all of the snipers in City 17.

Break the mini-teleporter in Kleiner's lab.

Disintegrate 15 soldiers by throwing them into a Combine ball field.

Pin a soldier to the billboard in chapter Highway 17.

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Kill 3 enemies using the crane.

Hidden achievement — tap Reveal secrets to spoil

Survive the rooftop strider battle in the ruins of City 17.

Destroy six gunships in Half-Life 2.

Shut down the supression device by disabling its generators.

Survive the generator plaza standoff in chapter Anticitizen One.

Get through the toxic tunnel under City 17 in Half-Life 2.

Gain command of a squad of rebels in the uprising.

Survive the second turret standoff in Nova Prospekt.

Use the antlions to kill 50 enemies.

Hidden achievement — tap Reveal secrets to spoil

Kill five barnacles with one barrel.

Hidden achievement — tap Reveal secrets to spoil

Hidden achievement — tap Reveal secrets to spoil

Get the Gravity Gun in Black Mesa East.

Destroy the hunter-chopper in Half-Life 2.

Hidden achievement — tap Reveal secrets to spoil

Get the airboat's mounted gun.

Get the airboat.

Get the crowbar.

Escape the apartment block raid.