Zombie Chopper
Play through Ravenholm using only the Gravity Gun.
25 ✓ April 6th, 2010
Singularity Collapse
Destroy the Citadel's reactor core.
25 ✓ February 7th, 2010
Escape From City 17
Escape City 17 with Alyx.
20 ✓ April 8th, 2010
Vorticough
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
13 ✓ January 14th, 2010
Meet the Hunters
Survive the Hunter ambush with Alyx.
10 ✓ September 28th, 2008
Cache Checker
Find every radar cache in chapter Under The Radar.
10 ✓ March 7th, 2011
Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
10 ✓ October 1st, 2008
Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field.
10 ✓ February 7th, 2010
Follow Freeman
Gain command of a squad of rebels in the uprising.
10 ✓ January 31st, 2010
Hot PotatOwned
Kill a Combine soldier with his own grenade.
10 ✓ January 18th, 2010
Think Fast!
Kill an Elite Soldier with his own energy ball.
10 ✓ June 26th, 2008
Revenge!
Destroy the hunter-chopper in Half-Life 2.
10 ✓ January 14th, 2010
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
10 ✓ February 7th, 2010
Bug Hunt
Use the antlions to kill 50 enemies.
10 ✓ January 31st, 2010
Warden Freeman
Survive the second turret standoff in Nova Prospekt.
10 ✓ January 31st, 2010
Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One.
10 ✓ January 31st, 2010
Fight the Power
Shut down the supression device by disabling its generators.
10 ✓ February 5th, 2010
Giant Killer
Survive the rooftop strider battle in the ruins of City 17.
10 ✓ February 5th, 2010
Elevator Action
Survive long enough to get on the parking garage elevator.
10 ✓ April 7th, 2010
Live Bait
Help Alyx snipe 30 enemies in Episode One.
10 ✓ April 7th, 2010
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
5 ✓ September 4th, 2008
Twofer
Defeat both antlion guards outside the White Forest.
5 ✓ September 5th, 2008
Hit and Run
Run over 20 enemies with the car in Episode Two.
5 ✓ March 7th, 2011
Gunishment!
Destroy the Combine cannon in the junkyard.
5 ✓ September 30th, 2008
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar.
5 ✓ March 7th, 2011
Pedal to the Metal
Beat DOG in a race to the White Forest base.
5 ✓ March 7th, 2011
Secondary Silo Secured
Secure the launch doors on missile silo 2.
5 ✓ October 2nd, 2008
Lab Rat
Acquire the fully powered Aperture Science Handheld Portal Device.
5 ✓ March 7th, 2011
Bone Breaker
Kill 30 enemies with thrown physics objects.
5 ✓ January 14th, 2010
Deadly Harvest
Kill an enemy by planting a hopper mine.
5 ✓ January 31st, 2010
Hack Attack!
Kill five enemies with a Manhack.
5 ✓ January 31st, 2010
Grave Robber
Steal a Zombine's grenade.
5 ✓ September 30th, 2008
Zombie-que
Use flares to light 15 zombies on fire.
5 ✓ April 11th, 2010
Defiant
Hit the trashcan cop with the can.
5 ✓ January 13th, 2010
Submissive
Put the can in the trash.
5 ✓ June 26th, 2008
Malcontent
Escape the apartment block raid.
5 ✓ June 26th, 2008
What cat?
Break the mini-teleporter in Kleiner's lab.
5 ✓ January 13th, 2010
Trusty Hardware
Get the crowbar.
5 ✓ June 26th, 2008
Barnacle Bowling
Kill five barnacles with one barrel.
5 ✓ February 7th, 2010
Anchor's Aweigh!
Get the airboat.
5 ✓ January 13th, 2010
Heavy Weapons
Get the airboat's mounted gun.
5 ✓ January 14th, 2010
Zero-Point Energy
Get the Gravity Gun in Black Mesa East.
5 ✓ January 14th, 2010
Hallowed Ground
Escort Gregori safely through the church cemetery.
5 ✓ January 18th, 2010
OSHA Violation
Kill 3 enemies using the crane.
5 ✓ January 28th, 2010
Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17.
5 ✓ January 30th, 2010
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
5 ✓ January 18th, 2010
One Man Army
Destroy six gunships in Half-Life 2.
5 ✓ January 31st, 2010
Flushed
Kill an enemy with a toilet.
5 ✓ January 31st, 2010
"Radiation Levels Detected"
Get through the toxic tunnel under City 17 in Half-Life 2.
5 ✓ January 31st, 2010
Watch Your Head!
Make it to the bottom of the Citadel's main elevator shaft in one piece.
5 ✓ June 28th, 2008
Containment
Contain the Citadel core.
5 ✓ August 20th, 2008
Car Crusher
Use the cars to squash 15 antlions in Episode One.
5 ✓ April 7th, 2010
Attica!
Destroy the gunship in the hospital attic.
5 ✓ April 7th, 2010
Acid Reflex
Kill an acid antlion worker.
5 ✓ August 25th, 2008
Pinata Party
Find and break every web cache in Episode Two.
5 ✓ March 4th, 2011
Two Points
Use DOG's ball to make a basket in Eli's scrapyard.
2 ✓ January 14th, 2010
Aperture Science
Earn gold medals on all Portal challenges.
40 
The One Free Bullet
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
40 
Neighborhood Watch
Save all buildings outside the missile silo from destruction.
35 
Little Rocket Man
Send the garden gnome into space.
30 
Vanilla Crazy Cake
Beat all six Portal advanced maps.
30 
Impossible Defense
Successfully defend Gravel Pit without giving up a capture.
30 
🔐 Defense of the Armament
Save the missile silo from the Combine offensive.
20 
Fruitcake
Beat four Portal advanced maps.
20 
Rocket Science
Earn silver medals on all Portal challenges.
20 
Relentless Offense
Win Hydro without giving up a capture.
20 
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
20 
Get Some Grub
Squish every antlion grub in Episode Two.
20 
Puttin' On a Clinic
Defeat the chopper in Episode Two without any misses.
15 
Master of Disguise
Trick an opposing medic into healing you.
15 
Hardcore
Accumulate 1000 total kills.
15 
Lambda Locator
Find all lambda caches in Half-Life 2.
15 
Citizen Escort
Don't let any citizens die when escorting them to the escape train.
15 
Payback
Kill a Hunter with its own flechettes.
10 
Heartbreaker
Complete Portal.
10 
Cupcake
Beat two Portal advanced maps.
10 
Basic Science
Earn bronze medals on all Portal challenges.
10 
Hard to Kill
Get five kills in a row without dying.
10 
With Friends Like these...
Play in a game with seven or more players from your friends list.
10 
Dynasty
Win 20 games.
10 
Lightning Offense
Win Well in 5 minutes or less.
10 
Impenetrable Defense
Successfully defend Dustbowl without giving up a capture.
10 
Pacifist
Contain the Citadel core without killing any stalkers.
10 
Fratricide
Do whatever it takes to survive.
5 
Partygoer
Make the correct party escort submission position decision.
5 
Terminal Velocity
Fall 30,000 feet.
5 
Long Jump
Jump 300 feet.
5 
Turret
Accumulate 10 turret kills with a single turret.
5 
Nemesis
Get five revenge kills.
5 
Powerhouse Offense
Win 2Fort with a shutout.
5 
Head of the Class
Play a complete round with every class.
5 
World Traveler
Play a complete game on every map.
5 
Team Doctor
Accumulate 25000 heal points as a Medic.
5 
Flamethrower
Set five enemies on fire in 30 seconds.
5 
Grey Matter
Get 25 headshots as a Sniper.
5 
Camera Shy
Detach security cameras from the walls.
5 
Friendly Fire
Knock down a turret with another turret.
5 
Conservationist
Kill five enemies with the same energy ball.
5 
Counter-Sniper
Kill all of the snipers in City 17.
5