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