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