“Radiation Levels Detected” – 5 points.
Get through the toxic tunnel under City 17 in Half-Life 2.
Acid Reflex– 5 points.
Kill an acid antlion worker.
Anchor’s Aweigh! – 5 points.
Get the airboat.
Aperture Science – 40 points.
Earn gold medals on all Portal challenges.
Atomizer – 10 points.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Attica! – 5 points.
Destroy the gunship in the hospital attic.
Barnacle Bowling – 5 points.
Kill five barnacles with one barrel.
Basic Science– 10 points.
Earn bronze medals on all Portal challenges.
Blast from the Past – 10 points.
Find the HEV Suit Charger faceplate in Eli’s scrapyard.
Bone Breaker – 5 points.
Kill 30 enemies with thrown physics objects.
Bug Hunt– 10 points.
Use the antlions to kill 50 enemies.
Cache Checker – 10 points.
Find every radar cache in chapter Under The Radar.
Camera Shy – 5 points.
Detach security cameras from the walls.
Car Crusher – 5 points.
Use the cars to squash 15 antlions in Episode One.
Citizen Escort – 15 points.
Don’t let any citizens die when escorting them to the escape train.
Conservationist – 5 points.
Kill five enemies with the same energy ball.
Containment – 5 points.
Contain the Citadel core.
Counter-Sniper – 5 points.
Kill all of the snipers in City 17.
Cupcake – 10 points.
Beat two Portal advanced maps.
Deadly Harvest – 5 points.
Kill an enemy by planting a hopper mine.
Defiance – 5 points.
Throw the trash at the guard in the beginning of HL:2
Dynasty – 10 points.
Win 20 games.
Elevator Action – 10 points.
Survive long enough to get on the parking garage elevator.
Escape From City 17 – 20 points.
Escape City 17 with Alyx.
Fight the Power – 10 points.
Shut down the supression device by disabling its generators.
Flamethrower – 5 points.
Set five enemies on fire in 30 seconds.
Flushed – 5 points.
Kill an enemy with a toilet.
Follow Freeman – 10 points.
Gain command of a squad of rebels in the uprising.
Fratricide – 5 points.
Do whatever it takes to survive.
Friendly Fire – 5 points.
Knock down a turret with another turret.
Fruitcake – 20 points.
Beat four Portal advanced maps.
Get Some Grub – 20 points.
Squish every antlion grub in Episode Two.
Giant Killer – 10 points.
Survive the rooftop strider battle in the ruins of City 17.
Gordon Propelled Rocket– 5 points.
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Grave Robber– 5 points.
Steal a Zombine’s grenade.
Grey Matter – 5 points.
Get 25 headshots as a Sniper.
Gunishment! – 5 points.
Destroy the Combine Autogun thats in the Junkyard
Hack Attack! – 5 points.
Kill five enemies with a Manhack.
Hard to Kill – 10 points.
Get five kills in a row without dying.
Hardcore – 15 points.
Accumulate 1000 total kills.
Head of the Class – 5 points.
Play a complete round with every class.
Heartbreaker – 10 points.
Heavy Weapons – 5 points.
Get the airboat’s mounted gun.
Hit and Run – 5 points.
Run over 20 enemies with the car in Episode Two.
Hot PotatOwned – 10 points.
Kill a Combine soldier with his own grenade.
Impenetrable Defense – 10 points.
Successfully defend Dustbowl without giving up a capture.
Impossible Defense – 30 points.
Successfully defend Gravel Pit without giving up a capture.
Into the Breach – 5 points.
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Keep Off the Sand! – 20 points.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Lab Rat – 5 points.
Acquire the fully powered Aperture Science Handheld Portal Device.
Lambda Locator – 15 points.
Find all lambda caches in Half-Life 2.
Lightning Offense – 10 points.
Win Well in 5 minutes or less.
Little Rocket Man – 30 points.
Send the garden gnome into space.
Live Bait – 10 points.
Help Alyx snipe 30 enemies in Episode One.
Long Jump – 5 points.
Jump 300 feet.
Malcontent – 5 points.
Escape the apartment block raid.
Master of Disguise – 15 points.
Trick an opposing medic into healing you.
Meet the Hunters – 10 points.
Survive the Hunter ambush with Alyx
Neighborhood Watch– 35 points.
Save all buildings outside the missile silo from destruction.
Nemesis – 5 points.
Get five revenge kills.
One Man Army – 5 points.
Destroy six gunships in Half-Life 2.
OSHA Violation – 5 points.
Kill 3 enemies using the crane.
Pacifist – 10 points.
Contain the Citadel core without killing any stalkers.
Partygoer – 5 points.
Make the correct party escort submission position decision.
Payback – 10 points.
Kill a Hunter with its own flechettes.
Pedal to the Metal – 5 points.
Beat DOG in a race to the White Forest base.
Pinata Party – 5 points.
Find and break every web cache in Episode Two.
Plaza Defender – 10 points.
Survive the generator plaza standoff in chapter Anticitizen One.
Powerhouse Offense – 5 points.
Win 2Fort with a shutout.
Puttin’ On a Clinic – 15 points.
Defeat the chopper in Episode Two without any misses.
Quiet Mountain Getaway – 10 points.
Survive the Ambush in White Forest In