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25 of 69 (36%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 20 Nov @ 4:13pm

Submissive

Put the can in the trash.
Unlocked 20 Nov @ 8:07pm

Malcontent

Escape the apartment block raid.
Unlocked 20 Nov @ 4:32pm

Trusty Hardware

Get the crowbar.
Unlocked 20 Nov @ 4:43pm

Anchor's Aweigh!

Get the airboat.
Unlocked 20 Nov @ 6:19pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 20 Nov @ 7:22pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 20 Nov @ 8:49pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 20 Nov @ 7:35pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 20 Nov @ 8:50pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 20 Nov @ 7:51pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 20 Nov @ 7:56pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 20 Nov @ 10:18pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 20 Nov @ 10:48pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 20 Nov @ 10:43pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 21 Nov @ 12:21am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 21 Nov @ 1:03am

Flushed

Kill an enemy with a toilet.
Unlocked 20 Nov @ 9:06pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 21 Nov @ 6:43am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 21 Nov @ 7:03am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 21 Nov @ 7:32am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 21 Nov @ 11:31am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 21 Nov @ 12:05pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 21 Nov @ 7:27am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 23 Nov @ 2:13am

Containment

Contain the Citadel core.
Unlocked 23 Nov @ 2:38am



What cat?

Break the mini-teleporter in Kleiner's lab.

Barnacle Bowling

Kill five barnacles with one barrel.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

One Man Army

Destroy six gunships in Half-Life 2.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Counter-Sniper

Kill all of the snipers in City 17.

Fight the Power

Shut down the supression device by disabling its generators.

Giant Killer

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

Lambda Locator

Find all lambda caches in Half-Life 2.

Pacifist

Contain the Citadel core without killing any stalkers.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Elevator Action

Survive long enough to get on the parking garage elevator.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Attica!

Destroy the gunship in the hospital attic.

Citizen Escort

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

Escape From City 17

Escape City 17 with Alyx.

The One Free Bullet

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

Conservationist

Kill five enemies with the same energy ball.

Think Fast!

Kill an Elite Soldier with his own energy ball.

Zombie-que

Use flares to light 15 zombies on fire.

Acid Reflex

Kill an acid antlion worker.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Into the Breach

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

Twofer

Defeat both antlion guards outside the White Forest.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Gunishment!

Destroy the Combine Autogun in the junkyard.

Cache Checker

Find every radar cache in chapter Under The Radar.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Gordon Propelled Rocket

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

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Little Rocket Man

Send the garden gnome into space.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.

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.