Full list of all 99 The Orange Box achievements worth 1,000 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Xbox 360.
Accumulate 1000 total kills.
Win 20 games.
Play in a game with seven or more players from your friends list.
Accumulate 10 turret kills with a single turret.
Get 25 headshots as a Sniper.
Play a complete round with every class.
Accumulate 25000 heal points as a Medic.
Kill all of the snipers in City 17.
Set five enemies on fire in 30 seconds.
Kill an enemy by planting a hopper mine.
Kill an acid antlion worker.
Acquire the fully powered Aperture Science Handheld Portal Device.
Kill 30 enemies with thrown physics objects.
Steal a Zombine's grenade.
Find and break every web cache in Episode Two.
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Defeat both antlion guards outside the White Forest.
Survive the Hunter ambush with Alyx.
Destroy the Combine cannon in the junkyard.
Find every radar cache in chapter Under The Radar.
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Survive the ambush at White Forest Inn.
Kill a Combine soldier with his own grenade.
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Contain the Citadel core.
Use the cars to squash 15 antlions in Episode One.
Survive long enough to get on the parking garage elevator.
Help Alyx snipe 30 enemies in Episode One.
Destroy the gunship in the hospital attic.
Run over 20 enemies with the car in Episode Two.
Secure the launch doors on missile silo 2.
Save the missile silo from the Combine offensive.
Kill an Elite Soldier with his own energy ball.
Put the can in the trash.
Escape the apartment block raid.
Break the mini-teleporter in Kleiner's lab.
Get the crowbar.
Kill five barnacles with one barrel.
Get the airboat.
Get the airboat's mounted gun.
Destroy the hunter-chopper in Half-Life 2.
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Get the Gravity Gun in Black Mesa East.
Use DOG's ball to make a basket in Eli's scrapyard.
Don't let any citizens die when escorting them to the escape train.
Escape City 17 with Alyx.
Play through Ravenholm using only the Gravity Gun.
Escort Gregori safely through the church cemetery.
Kill 3 enemies using the crane.
Pin a soldier to the billboard in chapter Highway 17.
Defend Little Odessa from the gunship attack.
Destroy six gunships in Half-Life 2.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Use the antlions to kill 50 enemies.
Kill an enemy with a toilet.
Survive the second turret standoff in Nova Prospekt.
Do whatever it takes to survive.
Make the correct party escort submission position decision.
Complete Portal.
Beat two Portal advanced maps.
Beat four Portal advanced maps.
Beat all six Portal advanced maps.
Knock down a turret with another turret.
Kill five enemies with a Manhack.
Kill five enemies with the same energy ball.
Use flares to light 15 zombies on fire.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Get through the toxic tunnel under City 17 in Half-Life 2.
Survive the generator plaza standoff in chapter Anticitizen One.
Shut down the supression device by disabling its generators.
Survive the rooftop strider battle in the ruins of City 17.
Destroy the Citadel's reactor core.
Contain the Citadel core without killing any stalkers.
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!
Squish every antlion grub in Episode Two.
Defeat the chopper in Episode Two without any misses.
Beat DOG in a race to the White Forest base.
Send the garden gnome into space.
Save all buildings outside the missile silo from destruction.
Kill a Hunter with its own flechettes.
Win 2Fort with a shutout.
Win Well in 5 minutes or less.
Win Hydro without giving up a capture.
Successfully defend Dustbowl without giving up a capture.
Successfully defend Gravel Pit without giving up a capture.
Play a complete game on every map.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Gain command of a squad of rebels in the uprising.
Hit the trashcan cop with the can.
Find all lambda caches in Half-Life 2.
Fall 30,000 feet.
Jump 300 feet.
Detach security cameras from the walls.
Get five revenge kills.
Get five kills in a row without dying.
Trick an opposing medic into healing you.
Earn bronze medals on all Portal challenges.
Earn silver medals on all Portal challenges.
Earn gold medals on all Portal challenges.