Aperture Science
Earn gold medals on all Portal challenges.
40 ✓ January 1st, 1753
The One Free Bullet
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
40 ✓ July 17th, 2009
Neighborhood Watch
Save all buildings outside the missile silo from destruction.
35 ✓ September 19th, 2013
Little Rocket Man
Send the garden gnome into space.
30 ✓ September 19th, 2013
Vanilla Crazy Cake
Beat all six Portal advanced maps.
30 ✓ January 1st, 1753
Impossible Defense
Successfully defend Gravel Pit without giving up a capture.
30 ✓ July 15th, 2009
Zombie Chopper
Play through Ravenholm using only the Gravity Gun.
25 ✓ July 14th, 2009
Singularity Collapse
Destroy the Citadel's reactor core.
25 ✓ February 2nd, 2011
Defense of the Armament
Save the missile silo from the Combine offensive.
20 ✓ September 19th, 2013
Fruitcake
Beat four Portal advanced maps.
20 ✓ January 1st, 1753
Rocket Science
Earn silver medals on all Portal challenges.
20 ✓ January 1st, 1753
Relentless Offense
Win Hydro without giving up a capture.
20 ✓ July 15th, 2009
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
20 ✓ July 16th, 2009
Escape From City 17
Escape City 17 with Alyx.
20 ✓ July 17th, 2009
Get Some Grub
Squish every antlion grub in Episode Two.
20 ✓ September 19th, 2013
Puttin' On a Clinic
Defeat the chopper in Episode Two without any misses.
15 ✓ September 19th, 2013
Master of Disguise
Trick an opposing medic into healing you.
15 ✓ July 15th, 2009
Lambda Locator
Find all lambda caches in Half-Life 2.
15 ✓ January 1st, 1753
Citizen Escort
Don't let any citizens die when escorting them to the escape train.
15 ✓ July 17th, 2009
Vorticough
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
13 ✓ July 14th, 2009
Meet the Hunters
Survive the Hunter ambush with Alyx.
10 ✓ September 19th, 2013
Cache Checker
Find every radar cache in chapter Under The Radar.
10 ✓ September 19th, 2013
Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
10 ✓ September 19th, 2013
Payback
Kill a Hunter with its own flechettes.
10 ✓ September 19th, 2013
Heartbreaker
Complete Portal.
10 ✓ January 1st, 1753
Cupcake
Beat two Portal advanced maps.
10 ✓ January 1st, 1753
Basic Science
Earn bronze medals on all Portal challenges.
10 ✓ January 1st, 1753
Hard to Kill
Get five kills in a row without dying.
10 ✓ July 15th, 2009
With Friends Like these...
Play in a game with seven or more players from your friends list.
10 ✓ July 18th, 2009
Dynasty
Win 20 games.
10 ✓ July 18th, 2009
Lightning Offense
Win Well in 5 minutes or less.
10 ✓ July 15th, 2009
Impenetrable Defense
Successfully defend Dustbowl without giving up a capture.
10 ✓ July 15th, 2009
Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field.
10 ✓ July 17th, 2009
Follow Freeman
Gain command of a squad of rebels in the uprising.
10 ✓ July 16th, 2009
Hot PotatOwned
Kill a Combine soldier with his own grenade.
10 ✓ July 15th, 2009
Think Fast!
Kill an Elite Soldier with his own energy ball.
10 ✓ July 17th, 2009
Revenge!
Destroy the hunter-chopper in Half-Life 2.
10 ✓ July 14th, 2009
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
10 ✓ July 14th, 2009
Bug Hunt
Use the antlions to kill 50 enemies.
10 ✓ July 16th, 2009
Warden Freeman
Survive the second turret standoff in Nova Prospekt.
10 ✓ July 16th, 2009
Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One.
10 ✓ July 16th, 2009
Fight the Power
Shut down the supression device by disabling its generators.
10 ✓ July 17th, 2009
Giant Killer
Survive the rooftop strider battle in the ruins of City 17.
10 ✓ July 17th, 2009
Pacifist
Contain the Citadel core without killing any stalkers.
10 ✓ July 17th, 2009
Elevator Action
Survive long enough to get on the parking garage elevator.
10 ✓ July 17th, 2009
Live Bait
Help Alyx snipe 30 enemies in Episode One.
10 ✓ July 17th, 2009
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
5 ✓ September 19th, 2013
Twofer
Defeat both antlion guards outside the White Forest.
5 ✓ September 19th, 2013
Hit and Run
Run over 20 enemies with the car in Episode Two.
5 ✓ September 19th, 2013
Gunishment!
Destroy the Combine cannon in the junkyard.
5 ✓ September 19th, 2013
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar.
5 ✓ September 19th, 2013
Pedal to the Metal
Beat DOG in a race to the White Forest base.
5 ✓ September 19th, 2013
Secondary Silo Secured
Secure the launch doors on missile silo 2.
5 ✓ September 19th, 2013
Lab Rat
Acquire the fully powered Aperture Science Handheld Portal Device.
5 ✓ January 1st, 1753
Fratricide
Do whatever it takes to survive.
5 ✓ January 1st, 1753
Partygoer
Make the correct party escort submission position decision.
5 ✓ January 1st, 1753
Terminal Velocity
Fall 30,000 feet.
5 ✓ January 1st, 1753
Long Jump
Jump 300 feet.
5 ✓ January 1st, 1753
Turret
Accumulate 10 turret kills with a single turret.
5 ✓ July 15th, 2009
Nemesis
Get five revenge kills.
5 ✓ July 15th, 2009
Powerhouse Offense
Win 2Fort with a shutout.
5 ✓ July 15th, 2009
Head of the Class
Play a complete round with every class.
5 ✓ July 15th, 2009
World Traveler
Play a complete game on every map.
5 ✓ July 15th, 2009
Flamethrower
Set five enemies on fire in 30 seconds.
5 ✓ July 18th, 2009
Grey Matter
Get 25 headshots as a Sniper.
5 ✓ July 15th, 2009
Camera Shy
Detach security cameras from the walls.
5 ✓ January 1st, 1753
Friendly Fire
Knock down a turret with another turret.
5 ✓ January 1st, 1753
Bone Breaker
Kill 30 enemies with thrown physics objects.
5 ✓ July 14th, 2009
Deadly Harvest
Kill an enemy by planting a hopper mine.
5 ✓ July 16th, 2009
Hack Attack!
Kill five enemies with a Manhack.
5 ✓ July 16th, 2009
Conservationist
Kill five enemies with the same energy ball.
5 ✓ July 17th, 2009
Grave Robber
Steal a Zombine's grenade.
5 ✓ July 17th, 2009
Zombie-que
Use flares to light 15 zombies on fire.
5 ✓ July 17th, 2009
Defiant
Hit the trashcan cop with the can.
5 ✓ January 1st, 1753
Submissive
Put the can in the trash.
5 ✓ January 1st, 1753
Malcontent
Escape the apartment block raid.
5 ✓ January 1st, 1753
What cat?
Break the mini-teleporter in Kleiner's lab.
5 ✓ January 1st, 1753
Trusty Hardware
Get the crowbar.
5 ✓ January 1st, 1753
Barnacle Bowling
Kill five barnacles with one barrel.
5 ✓ January 1st, 1753
Anchor's Aweigh!
Get the airboat.
5 ✓ January 1st, 1753
Heavy Weapons
Get the airboat's mounted gun.
5 ✓ July 14th, 2009
Zero-Point Energy
Get the Gravity Gun in Black Mesa East.
5 ✓ July 14th, 2009
Hallowed Ground
Escort Gregori safely through the church cemetery.
5 ✓ July 14th, 2009
OSHA Violation
Kill 3 enemies using the crane.
5 ✓ July 15th, 2009
Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17.
5 ✓ July 16th, 2009
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
5 ✓ July 15th, 2009
One Man Army
Destroy six gunships in Half-Life 2.
5 ✓ July 16th, 2009
Flushed
Kill an enemy with a toilet.
5 ✓ July 16th, 2009
"Radiation Levels Detected"
Get through the toxic tunnel under City 17 in Half-Life 2.
5 ✓ July 16th, 2009
Counter-Sniper
Kill all of the snipers in City 17.
5 ✓ July 17th, 2009
Watch Your Head!
Make it to the bottom of the Citadel's main elevator shaft in one piece.
5 ✓ July 17th, 2009
Containment
Contain the Citadel core.
5 ✓ July 17th, 2009
Car Crusher
Use the cars to squash 15 antlions in Episode One.
5 ✓ July 17th, 2009
Attica!
Destroy the gunship in the hospital attic.
5 ✓ July 17th, 2009
Acid Reflex
Kill an acid antlion worker.
5 ✓ September 19th, 2013
Pinata Party
Find and break every web cache in Episode Two.
5 ✓ September 19th, 2013
Two Points
Use DOG's ball to make a basket in Eli's scrapyard.
2 ✓ July 14th, 2009
Hardcore
Accumulate 1000 total kills.
15 
Team Doctor
Accumulate 25000 heal points as a Medic.
5