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52 of 69 (75%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 28 Dec, 2014 @ 10:59pm

Submissive

Put the can in the trash.
Unlocked 27 Dec, 2014 @ 4:53pm

Malcontent

Escape the apartment block raid.
Unlocked 27 Dec, 2014 @ 5:11pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 1 Jan, 2015 @ 12:00am

Trusty Hardware

Get the crowbar.
Unlocked 27 Dec, 2014 @ 5:24pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 27 Dec, 2014 @ 5:46pm

Anchor's Aweigh!

Get the airboat.
Unlocked 27 Dec, 2014 @ 6:26pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 28 Dec, 2014 @ 4:10am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 26 Feb, 2015 @ 3:51am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 28 Dec, 2014 @ 5:37pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 28 Dec, 2014 @ 5:56pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 28 Dec, 2014 @ 5:56pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 28 Dec, 2014 @ 6:00pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 4 Jan, 2015 @ 9:51pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 4 Jan, 2015 @ 9:39pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 5 Jan, 2015 @ 3:42am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 5 Jan, 2015 @ 4:00am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 5 Jan, 2015 @ 3:35am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 5 Jan, 2015 @ 8:47pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 4 Dec, 2015 @ 5:43pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 30 May, 2015 @ 11:53pm

Flushed

Kill an enemy with a toilet.
Unlocked 25 Jan, 2015 @ 10:44pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 25 Jan, 2015 @ 8:27pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 25 Jan, 2015 @ 10:23pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 25 Jan, 2015 @ 11:22pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 25 Jan, 2015 @ 11:51pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 29 Jan, 2015 @ 3:01am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 30 Jan, 2015 @ 2:47am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 6 Feb, 2015 @ 11:00pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 6 Feb, 2015 @ 11:17pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 7 Feb, 2015 @ 2:52am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 7 Dec, 2015 @ 3:27am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 30 May, 2015 @ 11:34pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 5:10pm

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 5:10pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 5:10pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 5:10pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 5:10pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 5:10pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 5:10pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 5:10pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 5:10pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 5:10pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 17 Nov @ 5:10pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Nov @ 5:10pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Nov @ 5:10pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Nov @ 5:10pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Nov @ 5:10pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Nov @ 5:10pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Nov @ 5:10pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Nov @ 5:10pm

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 17 Nov @ 5:10pm



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.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

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.

Hot Potat0wned

Kill a Combine soldier with his own grenade.