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54 of 69 (78%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 17 Nov, 2013 @ 6:43am

Submissive

Put the can in the trash.
Unlocked 23 Feb, 2012 @ 11:07am

Malcontent

Escape the apartment block raid.
Unlocked 23 Feb, 2012 @ 11:20am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 23 Feb, 2012 @ 11:25am

Trusty Hardware

Get the crowbar.
Unlocked 23 Feb, 2012 @ 11:32am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 17 Nov, 2013 @ 7:46am

Anchor's Aweigh!

Get the airboat.
Unlocked 24 Feb, 2012 @ 12:59am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 24 Feb, 2012 @ 5:37am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 24 Feb, 2012 @ 6:04am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 24 Feb, 2012 @ 5:54am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 24 Feb, 2012 @ 6:21am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 24 Feb, 2012 @ 6:22am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 4 Mar, 2017 @ 2:45am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 19 Nov, 2013 @ 11:30am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 24 Feb, 2012 @ 8:12am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 20 Nov, 2013 @ 9:41am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 16 Nov @ 1:59pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 24 Feb, 2012 @ 9:41am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 25 Feb, 2012 @ 1:12am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 17 Nov @ 3:02am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 25 Feb, 2012 @ 1:04am

Flushed

Kill an enemy with a toilet.
Unlocked 5 Jan, 2020 @ 6:23am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 25 Feb, 2012 @ 10:44am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 25 Feb, 2012 @ 11:06am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 25 Feb, 2012 @ 11:49am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 25 Feb, 2012 @ 12:31pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 7 Dec, 2013 @ 7:30am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 26 Feb, 2012 @ 10:32am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 9 Mar, 2012 @ 1:30am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 20 Dec, 2013 @ 10:04am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 9 Mar, 2012 @ 2:23am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 17 Nov @ 11:19am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 5:55pm

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 6:07pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 6:07pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 18 Nov @ 6:21am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 18 Nov @ 6:46am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 18 Nov @ 7:30am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 18 Nov @ 7:54am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 18 Nov @ 8:01am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 18 Nov @ 8:01am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 18 Nov @ 6:21am

Acid Reflex

Kill an acid antlion worker.
Unlocked 18 Nov @ 9:01am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 18 Nov @ 11:37am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 18 Nov @ 9:20am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 18 Nov @ 11:54am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 18 Nov @ 12:54pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 18 Nov @ 1:27pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 9 Dec @ 2:41am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 9 Dec @ 2:49am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 18 Nov @ 12:54pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 18 Nov @ 9:09am

Grave Robber

Steal a Zombine's grenade.
Unlocked 18 Nov @ 10:29am

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.
Unlocked 18 Nov @ 8:05am



Lambda Locator

Find all lambda caches in Half-Life 2.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Conservationist

Kill five enemies with the same energy ball.

Think Fast!

Kill an Elite Soldier with his own energy ball.

Get Some Grub

Squish every antlion grub in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

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.

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.

Hot Potat0wned

Kill a Combine soldier with his own grenade.