Half-Life 2

Malcontent

Escape the apartment block raid.

Trusty Hardware

Get the crowbar.

Anchor's Aweigh!

Get the airboat.

Heavy Weapons

Get the airboat's mounted gun.

Submissive

Put the can in the trash.

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Hallowed Ground

Escort Gregori safely through the church cemetery.

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.

Barnacle Bowling

Kill five barnacles with one barrel.

Defiant

Hit the trashcan cop with the can.

Bug Hunt

Use the antlions to kill 50 enemies.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

Follow Freeman

Gain command of a squad of rebels in the uprising.

Radiation Levels Detected

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

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Fight the Power

Shut down the supression device by disabling its generators.

One Man Army

Destroy six gunships in Half-Life 2.

Giant Killer

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

Singularity Collapse

Destroy the Citadel's reactor core.

OSHA Violation

Kill 3 enemies using the crane.

Blast from the Past

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

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

Atomizer

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

What cat?

Break the mini-teleporter in Kleiner's lab.

Counter-Sniper

Kill all of the snipers in City 17.

Two Points

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

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.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Watch Your Head!

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

Containment

Contain the Citadel core.

Flushed

Kill an enemy with a toilet.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Hack Attack!

Kill five enemies with a Manhack.

Acid Reflex

Kill an acid antlion worker.

Elevator Action

Survive long enough to get on the parking garage elevator.

Into the Breach

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

Attica!

Destroy the gunship in the hospital attic.

Escape From City 17

Escape City 17 with Alyx.

Twofer

Defeat both antlion guards outside the White Forest.

Keep Off the Sand!

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

Meet the Hunters

Survive the Hunter ambush with Alyx.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Gunishment!

Destroy the Combine Autogun in the junkyard.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Defense of the Armament

Save the missile silo from the Combine offensive.

Gordon Propelled Rocket

Unlock the rocket launcher lambda 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.

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.

Grave Robber

Steal a Zombine's grenade.

Think Fast!

Kill an Elite Soldier with his own energy ball.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Payback

Kill a Hunter with its own flechettes.

Pacifist

Contain the Citadel core without killing any stalkers.

Piñata Party

Find and break every web cache in Episode Two.

Conservationist

Kill five enemies with the same energy ball.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

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.

Zombie-que

Use flares to light 15 zombies on fire.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Get Some Grub

Squish every antlion grub in Episode Two.