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