Jun 26, 09
Into the Breach (5G)
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Jun 26, 09
Citizen Escort (15G)
Don't let any citizens die when escorting them to the escape train.
Jun 21, 09
Jun 21, 09
Elevator Action (10G)
Survive long enough to get on the parking garage elevator.
Mar 29, 09
Attica! (5G)
Destroy the gunship in the hospital attic.
Mar 29, 09
Dec 30, 08
Watch Your Head! (5G)
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Dec 24, 08
Giant Killer (10G)
Survive the rooftop strider battle in the ruins of City 17.
Dec 23, 08
Think Fast! (10G)
Kill an Elite Soldier with his own energy ball.
Dec 23, 08
Dec 23, 08
Fight the Power (10G)
Shut down the supression device by disabling its generators.
Dec 23, 08
Flushed (5G)
Kill an enemy with a toilet.
Dec 23, 08
Plaza Defender (10G)
Survive the generator plaza standoff in chapter Anticitizen One.
Dec 22, 08
Dec 22, 08
Follow Freeman (10G)
Gain command of a squad of rebels in the uprising.
Dec 22, 08
Dec 22, 08
Dec 21, 08
Dec 19, 08
Bone Breaker (5G)
Kill 30 enemies with thrown physics objects.
Dec 19, 08
Two Points (2G)
Use DOG's ball to make a basket in Eli's scrapyard.
Dec 19, 08
Dec 19, 08
Revenge! (10G)
Destroy the hunter-chopper in Half-Life 2.
Dec 19, 08
Zombie Chopper (25G)
Play through Ravenholm using only the Gravity Gun.
Dec 19, 08
Dec 17, 08
Dec 16, 08
Jan 14, 08
Jan 14, 08
Jan 14, 08
Dec 28, 07
Dec 28, 07
Dec 28, 07
Lab Rat (5G)
Acquire the fully powered Aperture Science Handheld Portal Device.
Dec 28, 07
Warden Freeman (10G)
Survive the second turret standoff in Nova Prospekt.
Bug Hunt (10G)
Use the antlions to kill 50 enemies.
Atomizer (10G)
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Locked
Fruitcake (20G)
Beat four Portal advanced maps.
Locked
Keep Off the Sand! (20G)
Cross the antlion beach in chapter Sandtraps without touching the sand.
Locked
Vorticough (13G)
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Locked
Cupcake (10G)
Beat two Portal advanced maps.
Locked
Partygoer (5G)
Make the correct party escort submission position decision.
Locked
What cat? (5G)
Break the mini-teleporter in Kleiner's lab.
Locked
Zombie-que (5G)
Use flares to light 15 zombies on fire.
Locked
Pacifist (10G)
Contain the Citadel core without killing any stalkers.
Locked
Car Crusher (5G)
Use the cars to squash 15 antlions in Episode One.
Locked
Live Bait (10G)
Help Alyx snipe 30 enemies in Episode One.
Locked
The One Free Bullet (40G)
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and...
Locked
Pinata Party (5G)
Find and break every web cache in Episode Two.
Locked
Hit and Run (5G)
Run over 20 enemies with the car in Episode Two.
Locked
Cache Checker (10G)
Find every radar cache in chapter Under The Radar.
Locked
Payback (10G)
Kill a Hunter with its own flechettes.
Locked
Turret (5G)
Accumulate 10 turret kills with a single turret.
Locked
Nemesis (5G)
Get five revenge kills.
Locked
Hardcore (15G)
Accumulate 1000 total kills.
Locked
Team Doctor (5G)
Accumulate 25000 heal points as a Medic.
Locked
Camera Shy (5G)
Detach security cameras from the walls.
Locked