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.
Play in a game with seven or more players from your friends list.
Earn gold medals on all Portal challenges.
Earn silver medals on all Portal challenges.
Earn bronze medals on all Portal challenges.
Beat all six Portal advanced maps.
Beat four Portal advanced maps.
Beat two Portal advanced maps.
Fall 30,000 feet.
Complete Portal.
Jump 300 feet.
Make the correct party escort submission position decision.
Detach security cameras from the walls.
Do whatever it takes to survive.
Knock down a turret with another turret.
Acquire the fully powered Aperture Science Handheld Portal Device.
Win 20 games.
Set five enemies on fire in 30 seconds.
Play a complete round with every class.
Get 25 headshots as a Sniper.
Get five revenge kills.
Accumulate 25000 heal points as a Medic.
Play a complete game on every map.
Successfully defend Gravel Pit without giving up a capture.
Successfully defend Dustbowl without giving up a capture.
Win Hydro without giving up a capture.
Win Well in 5 minutes or less.
Save all buildings outside the missile silo from destruction.
Save the missile silo from the Combine offensive.
Secure the launch doors on missile silo 2.
Send the garden gnome into space.
Beat DOG in a race to the White Forest base.
Find every radar cache in chapter Under The Radar.
Survive the ambush at White Forest Inn.
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Run over 20 enemies with the car in Episode Two.
Destroy the Combine cannon in the junkyard.
Defeat the chopper in Episode Two without any misses.
Survive the Hunter ambush with Alyx.
Kill a Hunter with its own flechettes.
Find and break every web cache in Episode Two.
Squish every antlion grub in Episode Two.
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Defeat both antlion guards outside the White Forest.
Kill an acid antlion worker.
Use flares to light 15 zombies on fire.
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.
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!
Steal a Zombine's grenade.
Contain the Citadel core without killing any stalkers.
Contain the Citadel core.
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Destroy the Citadel's reactor core.
Kill five enemies with the same energy ball.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Survive the rooftop strider battle in the ruins of City 17.
Kill an Elite Soldier with his own energy ball.
Find all lambda caches in Half-Life 2.
Shut down the supression device by disabling its generators.
Kill all of the snipers in City 17.
Survive the generator plaza standoff in chapter Anticitizen One.
Get through the toxic tunnel under City 17 in Half-Life 2.
Kill an enemy by planting a hopper mine.
Gain command of a squad of rebels in the uprising.
Survive the second turret standoff in Nova Prospekt.
Kill five enemies with a Manhack.
Kill an enemy with a toilet.
Destroy six gunships in Half-Life 2.
Use the antlions to kill 50 enemies.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Pin a soldier to the billboard in chapter Highway 17.
Kill 3 enemies using the crane.
Win 2Fort with a shutout.
Accumulate 10 turret kills with a single turret.
Trick an opposing medic into healing you.
Get five kills in a row without dying.
Defend Little Odessa from the gunship attack.
Kill a Combine soldier with his own grenade.
Play through Ravenholm using only the Gravity Gun.
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.
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Get the Gravity Gun in Black Mesa East.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Destroy the hunter-chopper in Half-Life 2.
Get the airboat's mounted gun.
Get the airboat.
Kill five barnacles with one barrel.
Get the crowbar.
Break the mini-teleporter in Kleiner's lab.
Escape the apartment block raid.
Hit the trashcan cop with the can.
Put the can in the trash.