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53 of 69 (77%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 5 Jan, 2016 @ 5:30am

Submissive

Put the can in the trash.
Unlocked 9 Nov, 2014 @ 2:54am

Malcontent

Escape the apartment block raid.
Unlocked 9 Nov, 2014 @ 3:01am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 26 Dec, 2015 @ 6:36am

Trusty Hardware

Get the crowbar.
Unlocked 25 Jun, 2013 @ 3:59am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 25 Jun, 2013 @ 4:14am

Anchor's Aweigh!

Get the airboat.
Unlocked 25 Jun, 2013 @ 4:46am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 25 Jun, 2013 @ 5:16am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 27 Dec, 2015 @ 1:37am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 25 Jun, 2013 @ 5:26am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 25 Jun, 2013 @ 5:40am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 25 Jun, 2013 @ 5:40am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 10 Jan, 2016 @ 7:30am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 16 Jan, 2016 @ 4:05am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 27 Dec, 2015 @ 5:49am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 27 Dec, 2015 @ 6:24am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 27 Dec, 2015 @ 6:39am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 31 Jan, 2015 @ 4:10am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 28 Dec, 2015 @ 7:44am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 10 Jan, 2016 @ 7:12am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 28 Dec, 2015 @ 7:40am

Flushed

Kill an enemy with a toilet.
Unlocked 23 Jan, 2016 @ 4:03am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 28 Dec, 2015 @ 1:51pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 26 Apr, 2015 @ 1:12am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 28 Dec, 2015 @ 2:37pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 28 Dec, 2015 @ 2:55pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 23 Jan, 2016 @ 4:12am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 29 Dec, 2015 @ 12:32am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 29 Dec, 2015 @ 1:00am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 6 Feb, 2016 @ 1:59am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 29 Dec, 2015 @ 1:30am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 10 Jan, 2016 @ 6:59am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 5 Feb, 2016 @ 1:09am

Acid Reflex

Kill an acid antlion worker.
Unlocked 19 Nov @ 9:31am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 19 Nov @ 9:31am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 19 Nov @ 9:31am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 19 Nov @ 9:31am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 19 Nov @ 9:31am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 19 Nov @ 9:31am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 19 Nov @ 9:31am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 19 Nov @ 9:31am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Nov @ 9:31am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Nov @ 9:31am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 19 Nov @ 9:31am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 19 Nov @ 9:31am

Little Rocket Man

Send the garden gnome into space.
Unlocked 19 Nov @ 9:31am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Nov @ 9:31am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 19 Nov @ 9:31am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Nov @ 9:31am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 19 Nov @ 9:31am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 19 Nov @ 9:31am

Grave Robber

Steal a Zombine's grenade.
Unlocked 19 Nov @ 9:31am

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 19 Nov @ 9:31am



Watch Your Head!

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

Containment

Contain the Citadel core.

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.

Piñata Party

Find and break every web cache in Episode Two.

Payback

Kill a Hunter with its own flechettes.

Hot Potat0wned

Kill a Combine soldier with his own grenade.