- Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
11 June 2009 - 1 guide
- Hit and Run
Run over 20 enemies with the car in Episode Two.
11 June 2009 - 1 guide
- Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar.
11 June 2009 - 1 guide
- Gunishment!
Destroy the Combine cannon in the junkyard.
11 June 2009 - 1 guide
- Puttin' On a Clinic
Defeat the chopper in Episode Two without any misses.
10 June 2009 - 3 guides
- Meet the Hunters
Survive the Hunter ambush with Alyx.
10 June 2009 - 1 guide
- Payback
Kill a Hunter with its own flechettes.
10 June 2009 - 2 guides
- Twofer
Defeat both antlion guards outside the White Forest.
10 June 2009 - 2 guides
- Get Some Grub
Squish every antlion grub in Episode Two.
10 June 2009 - 3 guides
- Pinata Party
Find and break every web cache in Episode Two.
10 June 2009 - 3 guides
- Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
10 June 2009 - 2 guides
- Acid Reflex
Kill an acid antlion worker.
10 June 2009 - 1 guide
- The One Free Bullet
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
09 June 2009 - 5 guides
- Escape From City 17
Escape City 17 with Alyx.
09 June 2009 - 2 guides
- Citizen Escort
Don't let any citizens die when escorting them to the escape train.
09 June 2009 - 3 guides
- Attica!
Destroy the gunship in the hospital attic.
09 June 2009 - 1 guide
- Live Bait
Help Alyx snipe 30 enemies in Episode One.
09 June 2009 - 2 guides
- Elevator Action
Survive long enough to get on the parking garage elevator.
09 June 2009 - 1 guide
- Zombie-que
Use flares to light 15 zombies on fire.
09 June 2009 - 2 guides
- Grave Robber
Steal a Zombine's grenade.
09 June 2009 - 3 guides
- Car Crusher
Use the cars to squash 15 antlions in Episode One.
Unlocked offline - 3 guides
- Pacifist
Contain the Citadel core without killing any stalkers.
09 June 2009 - 2 guides
- With Friends Like these...
Play in a game with seven or more players from your friends list.
26 April 2009 - 6 guides
- Warden Freeman
Survive the second turret standoff in Nova Prospekt.
Unlocked offline - 2 guides
- Lambda Locator
Find all lambda caches in Half-Life 2.
28 October 2008 - 3 guides
- Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
26 October 2008 - 8 guides
- Counter-Sniper
Kill all of the snipers in City 17.
26 October 2008 - 3 guides
- Turret
Accumulate 10 turret kills with a single turret.
26 October 2008 - 6 guides
- Impossible Defense
Successfully defend Gravel Pit without giving up a capture.
26 October 2008 - 4 guides
- Grey Matter
Get 25 headshots as a Sniper.
26 October 2008 - 5 guides
- Impenetrable Defense
Successfully defend Dustbowl without giving up a capture.
26 October 2008 - 3 guides
- Dynasty
Win 20 games.
26 October 2008 - 1 guide
- Barnacle Bowling
Kill five barnacles with one barrel.
25 October 2008 - 1 guide
- Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17.
25 October 2008 - 2 guides
- Team Doctor
Accumulate 25000 heal points as a Medic.
25 October 2008 - 12 guides
- Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field.
25 October 2008 - 3 guides
- Conservationist
Kill five enemies with the same energy ball.
25 October 2008 - 7 guides
- Nemesis
Get five revenge kills.
24 October 2008 - 5 guides
- Master of Disguise
Trick an opposing medic into healing you.
24 October 2008 - 6 guides
- Head of the Class
Play a complete round with every class.
24 October 2008 - 4 guides
- Relentless Offense
Win Hydro without giving up a capture.
24 October 2008 - 3 guides
- World Traveler
Play a complete game on every map.
18 October 2008 - 5 guides
- Lightning Offense
Win Well in 5 minutes or less.
18 October 2008 - 3 guides
- Powerhouse Offense
Win 2Fort with a shutout.
18 October 2008 - 3 guides
- Flamethrower
Set five enemies on fire in 30 seconds.
18 October 2008 - 8 guides
- Flushed
Kill an enemy with a toilet.
24 April 2008 - 5 guides
- Vorticough
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
22 April 2008 - 2 guides
- Think Fast!
Kill an Elite Soldier with his own energy ball.
08 April 2008 - 3 guides
- Containment
Contain the Citadel core.
08 April 2008 - 1 guide
- Watch Your Head!
Make it to the bottom of the Citadel's main elevator shaft in one piece.
08 April 2008 - 2 guides
- Camera Shy
Detach security cameras from the walls.
23 March 2008 - 2 guides
- Two Points
Use DOG's ball to make a basket in Eli's scrapyard.
22 March 2008 - 3 guides
- Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
22 March 2008 - 2 guides
- Zombie Chopper
Play through Ravenholm using only the Gravity Gun.
22 March 2008 - 6 guides
- Singularity Collapse
Destroy the Citadel's reactor core.
14 March 2008 - 1 guide
- Giant Killer
Survive the rooftop strider battle in the ruins of City 17.
13 March 2008 - 1 guide
- One Man Army
Destroy six gunships in Half-Life 2.
11 March 2008 - 2 guides
- Fight the Power
Shut down the supression device by disabling its generators.
11 March 2008 - 1 guide
- Deadly Harvest
Kill an enemy by planting a hopper mine.
11 March 2008 - 2 guides
- Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One.
11 March 2008 - 2 guides
- "Radiation Levels Detected"
Get through the toxic tunnel under City 17 in Half-Life 2.
11 March 2008 - 2 guides
- Hack Attack!
Kill five enemies with a Manhack.
10 March 2008 - 4 guides
- Follow Freeman
Gain command of a squad of rebels in the uprising.
10 March 2008 - 1 guide
- Hot PotatOwned
Kill a Combine soldier with his own grenade.
10 March 2008 - 2 guides
- Bug Hunt
Use the antlions to kill 50 enemies.
10 March 2008 - 1 guide
- OSHA Violation
Kill 3 enemies using the crane.
09 March 2008 - 2 guides
- Hard to Kill
Get five kills in a row without dying.
08 March 2008 - 8 guides
- Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
05 March 2008 - 2 guides
- Hallowed Ground
Escort Gregori safely through the church cemetery.
05 March 2008 - 3 guides
- Bone Breaker
Kill 30 enemies with thrown physics objects.
03 March 2008 - 2 guides
- Zero-Point Energy
Get the Gravity Gun in Black Mesa East.
03 March 2008 - 1 guide
- Revenge!
Destroy the hunter-chopper in Half-Life 2.
03 March 2008 - 1 guide
- Heavy Weapons
Get the airboat's mounted gun.
03 March 2008 - 1 guide
- Anchor's Aweigh!
Get the airboat.
02 March 2008 - 1 guide
- Long Jump
Jump 300 feet.
02 March 2008 - 6 guides
- Friendly Fire
Knock down a turret with another turret.
02 March 2008 - 3 guides
- Vanilla Crazy Cake
Beat all six Portal advanced maps.
02 March 2008 - 3 guides
- Fruitcake
Beat four Portal advanced maps.
02 March 2008 - 3 guides
- Terminal Velocity
Fall 30,000 feet.
02 March 2008 - 5 guides
- Cupcake
Beat two Portal advanced maps.
02 March 2008 - 3 guides
- Heartbreaker
Complete Portal.
02 March 2008 - 1 guide
- Partygoer
Make the correct party escort submission position decision.
02 March 2008 - 3 guides
- Fratricide
Do whatever it takes to survive.
02 March 2008 - 2 guides
- Lab Rat
Acquire the fully powered Aperture Science Handheld Portal Device.
02 March 2008 - 1 guide
- Trusty Hardware
Get the crowbar.
21 January 2008 - 1 guide
- What cat?
Break the mini-teleporter in Kleiner's lab.
21 January 2008 - 2 guides
- Malcontent
Escape the apartment block raid.
21 January 2008 - 1 guide
- Submissive
Put the can in the trash.
21 January 2008 - 3 guides
- Defiant
Hit the trashcan cop with the can.
21 January 2008 - 3 guides