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