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