Game Achievements:

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