"Radiation Levels Detected" - 5 points - Get throughthe 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.
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.
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 - Complete Portal.
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-Life2.
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.
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-Life2.
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.
Relentless Offense - 20 points - Win Hydro without giving up a capture.
Revenge! - 10 points - Destroy the hunter-chopper in Half-Life2.
Rocket Science - 20 points - Earn silver medals on all Portal challenges.
Targetted Advertising - 5 points - Pin a soldier to the billboard in chapter Highway 17.
Team Doctor - 5 points - Accumulate 25000 heal points as a Medic.
Terminal Velocity - 5 points - Fall 30,000 feet.
The One Free Bullet - 40 points - Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!.
Think Fast! - 10 points - Kill an Elite Soldier with his own energy ball.
Trusty Hardware - 5 points - Get the crowbar.
Turret - 5 points - Accumulate 10 turret kills with a single turret.
Two Points - 2 points - Use DOG's ball to make a basket in Eli's scrapyard.
Vanilla Crazy Cake - 30 points - Beat all six Portal advanced maps.
Vorticough - 13 points - Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Warden Freeman - 10 points - Survive the second turret standoff in Nova Prospekt.
Watch Your Head! - 5 points - Make it to the bottom of the Citadel's main elevator shaft in one piece.
What cat? - 5 points - Break the mini-teleporter in Kleiner's lab.
With Friends Like these.. - 10 points - Play in a game with seven or more players from your friends list.
World Traveler - 5 points - Play a complete game on every map.
Zero-Point Energy - 5 points - Get the Gravity Gun in Black Mesa East.
Zombie Chopper - 25 points - Play through Ravenholm using only the Gravity Gun.
Zombie-que - 5 points - Use flares to light 15 zombies on fire.
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