| | Title | Gamerscore |
 |
"Radiation Levels Detected"
Get through the toxic tunnel under City 17 in Half-Life 2. | 5  |
|
Acid Reflex
Kill an acid antlion worker. | 5 |
|
Anchor's Aweigh!
Get the airboat. | 5 |
|
Aperture Science
Earn gold medals on all Portal challenges. | 40 |
|
Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field. | 10 |
|
Attica!
Destroy the gunship in the hospital attic. | 5 |
|
Barnacle Bowling
Kill five barnacles with one barrel. | 5 |
|
Basic Science
Earn bronze medals on all Portal challenges. | 10 |
|
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard. | 10 |
|
Bone Breaker
Kill 30 enemies with thrown physics objects. | 5 |
|
Bug Hunt
Use the antlions to kill 50 enemies. | 10 |
|
Cache Checker
Find every radar cache in chapter Under The Radar. | 10 |
|
Camera Shy
Detach security cameras from the walls. | 5 |
|
Car Crusher
Use the cars to squash 15 antlions in Episode One. | 5 |
|
Citizen Escort
Don't let any citizens die when escorting them to the escape train. | 15 |
|
Conservationist
Kill five enemies with the same energy ball. | 5 |
|
Containment
Contain the Citadel core. | 5 |
|
Counter-Sniper
Kill all of the snipers in City 17. | 5 |
|
Cupcake
Beat two Portal advanced maps. | 10 |
|
Deadly Harvest
Kill an enemy by planting a hopper mine. | 5 |
 |  Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 20 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
Dynasty
Win 20 games. | 10 |
|
Elevator Action
Survive long enough to get on the parking garage elevator. | 10 |
|
Escape From City 17
Escape City 17 with Alyx. | 20 |
|
Fight the Power
Shut down the supression device by disabling its generators. | 10 |
|
Flamethrower
Set five enemies on fire in 30 seconds. | 5 |
|
Flushed
Kill an enemy with a toilet. | 5 |
|
Follow Freeman
Gain command of a squad of rebels in the uprising. | 10 |
|
Fratricide
Do whatever it takes to survive. | 5 |
|
Friendly Fire
Knock down a turret with another turret. | 5 |
|
Fruitcake
Beat four Portal advanced maps. | 20 |
|
Get Some Grub
Squish every antlion grub in Episode Two. | 20 |
|
Giant Killer
Survive the rooftop strider battle in the ruins of City 17. | 10 |
|
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar. | 5 |
|
Grave Robber
Steal a Zombine's grenade. | 5 |
|
Grey Matter
Get 25 headshots as a Sniper. | 5 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
Hack Attack!
Kill five enemies with a Manhack. | 5 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
Hard to Kill
Get five kills in a row without dying. | 10 |
|
Hardcore
Accumulate 1000 total kills. | 15 |
|
Head of the Class
Play a complete round with every class. | 5 |
|
Heartbreaker
Complete Portal. | 10 |
|
Heavy Weapons
Get the airboat's mounted gun. | 5 |
|
Hit and Run
Run over 20 enemies with the car in Episode Two. | 5 |
|
Hot PotatOwned
Kill a Combine soldier with his own grenade. | 10 |
|
Impenetrable Defense
Successfully defend Dustbowl without giving up a capture. | 10 |
|
Impossible Defense
Successfully defend Gravel Pit without giving up a capture. | 30 |
|
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft. | 5 |
|
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand. | 20 |
|
Lab Rat
Acquire the fully powered Aperture Science Handheld Portal Device. | 5 |
|
Lambda Locator
Find all lambda caches in Half-Life 2. | 15 |
|
Lightning Offense
Win Well in 5 minutes or less. | 10 |
|
Little Rocket Man
Send the garden gnome into space. | 30 |
|
Live Bait
Help Alyx snipe 30 enemies in Episode One. | 10 |
|
Long Jump
Jump 300 feet. | 5 |
|
Malcontent
Escape the apartment block raid. | 5 |
|
Master of Disguise
Trick an opposing medic into healing you. | 15 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 10 |
|
Neighborhood Watch
Save all buildings outside the missile silo from destruction. | 35 |
|
Nemesis
Get five revenge kills. | 5 |
|
One Man Army
Destroy six gunships in Half-Life 2. | 5 |
|
OSHA Violation
Kill 3 enemies using the crane. | 5 |
|
Pacifist
Contain the Citadel core without killing any stalkers. | 10 |
|
Partygoer
Make the correct party escort submission position decision. | 5 |
|
Payback
Kill a Hunter with its own flechettes. | 10 |
|
Pedal to the Metal
Beat DOG in a race to the White Forest base. | 5 |
|
Pinata Party
Find and break every web cache in Episode Two. | 5 |
|
Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One. | 10 |
|
Powerhouse Offense
Win 2Fort with a shutout. | 5 |
|
Puttin' On a Clinic
Defeat the chopper in Episode Two without any misses. | 15 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 10 |
|
Relentless Offense
Win Hydro without giving up a capture. | 20 |
|
Revenge!
Destroy the hunter-chopper in Half-Life 2. | 10 |
|
Rocket Science
Earn silver medals on all Portal challenges. | 20 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 25 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17. | 5 |
|
Team Doctor
Accumulate 25000 heal points as a Medic. | 5 |
|
Terminal Velocity
Fall 30,000 feet. | 5 |
|
The One Free Bullet
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay! | 40 |
|
Think Fast!
Kill an Elite Soldier with his own energy ball. | 10 |
|
Trusty Hardware
Get the crowbar. | 5 |
|
Turret
Accumulate 10 turret kills with a single turret. | 5 |
|
Two Points
Use DOG's ball to make a basket in Eli's scrapyard. | 2 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
Vanilla Crazy Cake
Beat all 6 Portal Advanced Maps. | 30 |
|
Vorticough
Discover the hidden singing vortigaunt cave in chapter Water Hazard. | 13 |
|
Warden Freeman
Survive the second turret standoff in Nova Prospekt. | 10 |
|
Watch Your Head!
Make it to the bottom of the Citadel's main elevator shaft in one piece. | 5 |
|
What cat?
Break the mini-teleporter in Kleiner's lab. | 5 |
| Secret Achievement
To view this achievement, check the "Show Secret Achievement Details" option above | 5 |
|
With Friends Like these...
Play in a game with seven or more players from your friends list. | 10 |
|
World Traveler
Play a complete game on every map. | 5 |
|
Zero-Point Energy
Get the Gravity Gun in Black Mesa East. | 5 |
|
Zombie Chopper
Play through Ravenholm using only the Gravity Gun. | 25 |
|
Zombie-que
Use flares to light 15 zombies on fire. | 5 |
