Half-Life 2

Get Some Grub

Squish every antlion grub in Episode Two.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Zombie-que

Use flares to light 15 zombies on fire.

The One Free Bullet

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

Little Rocket Man

Send the garden gnome into space.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Conservationist

Kill five enemies with the same energy ball.

Piñata Party

Find and break every web cache in Episode Two.

Pacifist

Contain the Citadel core without killing any stalkers.

Payback

Kill a Hunter with its own flechettes.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Think Fast!

Kill an Elite Soldier with his own energy ball.

Grave Robber

Steal a Zombine's grenade.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Cache Checker

Find every radar cache in chapter Under The Radar.

Citizen Escort

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

Lambda Locator

Find all lambda caches in Half-Life 2.

Gordon Propelled Rocket

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

Defense of the Armament

Save the missile silo from the Combine offensive.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Gunishment!

Destroy the Combine Autogun in the junkyard.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Twofer

Defeat both antlion guards outside the White Forest.

Escape From City 17

Escape City 17 with Alyx.

Keep Off the Sand!

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

Attica!

Destroy the gunship in the hospital attic.

Into the Breach

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

Elevator Action

Survive long enough to get on the parking garage elevator.

Acid Reflex

Kill an acid antlion worker.

Containment

Contain the Citadel core.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Watch Your Head!

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

Hack Attack!

Kill five enemies with a Manhack.

Flushed

Kill an enemy with a toilet.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Gnome Alone

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.

Two Points

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

Counter-Sniper

Kill all of the snipers in City 17.

What cat?

Break the mini-teleporter in Kleiner's lab.

Atomizer

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

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

Blast from the Past

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

OSHA Violation

Kill 3 enemies using the crane.

Singularity Collapse

Giant Killer

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

One Man Army

Destroy six gunships in Half-Life 2.

Fight the Power

Shut down the supression device by disabling its generators.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Radiation Levels Detected

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

Follow Freeman

Gain command of a squad of rebels in the uprising.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

Bug Hunt

Use the antlions to kill 50 enemies.

Defiant

Barnacle Bowling

Kill five barnacles with one barrel.

Where Cubbage Fears to Tread

Hallowed Ground

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Submissive

Heavy Weapons

Get the airboat's mounted gun.

Anchor's Aweigh!

Get the airboat.

Trusty Hardware

Get the crowbar.

Malcontent

Escape the apartment block raid.