Half-Life 2

Malcontent

Common69.4%

Escape the apartment block raid.

Trusty Hardware

Common66.4%

Get the crowbar.

Anchor's Aweigh!

Common51.6%

Get the airboat.

Heavy Weapons

Common45.3%

Get the airboat's mounted gun.

Revenge!

Common43.1%

Destroy the hunter-chopper in Half-Life 2.

Zero-Point Energy

Common42.2%

Get the Gravity Gun in Black Mesa East.

Barnacle Bowling

Common36.0%

Kill five barnacles with one barrel.

Bug Hunt

Common30.7%

Use the antlions to kill 50 enemies.

Warden Freeman

Uncommon29.7%

Survive the second turret standoff in Nova Prospekt.

Follow Freeman

Uncommon29.6%

Gain command of a squad of rebels in the uprising.

Radiation Levels Detected

Uncommon28.9%

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

Plaza Defender

Uncommon28.3%

Survive the generator plaza standoff in chapter Anticitizen One.

One Man Army

Uncommon27.0%

Destroy six gunships in Half-Life 2.

Fight the Power

Uncommon26.9%

Shut down the supression device by disabling its generators.

Giant Killer

Uncommon25.9%

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

OSHA Violation

Uncommon21.2%

Kill 3 enemies using the crane.

Blast from the Past

Uncommon21.0%

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

Targetted Advertising

Uncommon16.4%

Pin a soldier to the billboard in chapter Highway 17.

Atomizer

Rare12.2%

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

What cat?

Rare12.0%

Break the mini-teleporter in Kleiner's lab.

Counter-Sniper

Rare10.5%

Kill all of the snipers in City 17.

Two Points

Rare9.6%

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

Vorticough

Rare9.1%

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Flushed

Rare6.8%

Kill an enemy with a toilet.

Hack Attack!

Rare6.7%

Kill five enemies with a Manhack.

Zombie Chopper

Rare6.6%

Play through Ravenholm using only the Gravity Gun.

Keep Off the Sand!

Rare5.4%

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

Lambda Locator

Legendary3.8%

Find all lambda caches in Half-Life 2.

Gnome Alone

Legendary2.8%

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.

Watch Your Head!

Legendary1.7%

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

Containment

Legendary1.6%

Contain the Citadel core.

Acid Reflex

Legendary1.4%

Kill an acid antlion worker.

Elevator Action

Legendary1.4%

Survive long enough to get on the parking garage elevator.

Attica!

Legendary1.3%

Destroy the gunship in the hospital attic.

Into the Breach

Legendary1.3%

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

Deadly Harvest

Legendary1.2%

Kill an enemy by planting a hopper mine.

Escape From City 17

Legendary1.2%

Escape City 17 with Alyx.

Twofer

Legendary1.2%

Defeat both antlion guards outside the White Forest.

Gunishment!

Legendary1.1%

Destroy the Combine Autogun in the junkyard.

Meet the Hunters

Legendary1.1%

Survive the Hunter ambush with Alyx.

Quiet Mountain Getaway

Legendary1.1%

Survive the ambush at White Forest Inn.

Secondary Silo Secured

Legendary1.1%

Secure the launch doors on missile silo 2.

Gordon Propelled Rocket

Legendary1.0%

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

Citizen Escort

Legendary0.9%

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

Defense of the Armament

Legendary0.9%

Save the missile silo from the Combine offensive.

Cache Checker

Legendary0.8%

Find every radar cache in chapter Under The Radar.

Grave Robber

Legendary0.8%

Steal a Zombine's grenade.

Pedal to the Metal

Legendary0.8%

Beat DOG in a race to the White Forest base.

Think Fast!

Legendary0.8%

Kill an Elite Soldier with his own energy ball.

Live Bait

Legendary0.7%

Help Alyx snipe 30 enemies in Episode One.

Bone Breaker

Legendary0.6%

Kill 30 enemies with thrown physics objects.

Car Crusher

Legendary0.6%

Use the cars to squash 15 antlions in Episode One.

Hit and Run

Legendary0.6%

Run over 20 enemies with the car in Episode Two.

Payback

Legendary0.5%

Kill a Hunter with its own flechettes.

Conservationist

Legendary0.4%

Kill five enemies with the same energy ball.

Hot Potat0wned

Legendary0.4%

Kill a Combine soldier with his own grenade.

Little Rocket Man

Legendary0.4%

Send the garden gnome into space.

Pacifist

Legendary0.4%

Contain the Citadel core without killing any stalkers.

Piñata Party

Legendary0.4%

Find and break every web cache in Episode Two.

Puttin' On a Clinic

Legendary0.4%

Defeat the chopper in Episode Two without any misses.

Zombie-que

Legendary0.4%

Use flares to light 15 zombies on fire.

Get Some Grub

Legendary0.3%

Squish every antlion grub in Episode Two.

Neighborhood Watch

Legendary0.3%

Save all buildings outside the missile silo from destruction.

The One Free Bullet

Legendary0.3%

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