Unlocked: Jan 14, 2012 7:20pm
Put the can in the trash.
Unlocked: Jan 14, 2012 7:23pm
Escape the apartment block raid.
Unlocked: Jan 14, 2012 7:34pm
Get the crowbar.
Unlocked: Jan 15, 2012 4:27pm
Kill five barnacles with one barrel.
Unlocked: Jan 16, 2012 9:54am
Get the airboat.
Unlocked: Jan 16, 2012 12:17pm
Get the airboat's mounted gun.
Unlocked: Jan 16, 2012 12:29pm
Destroy the hunter-chopper in Half-Life 2.
Unlocked: Jan 16, 2012 12:43pm
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked: Jan 16, 2012 12:44pm
Get the Gravity Gun in Black Mesa East.
Unlocked: May 18, 2013 5:46pm
Escort Gregori safely through the church cemetery.
Unlocked: May 20, 2013 11:40am
Kill 3 enemies using the crane.
Unlocked: May 20, 2013 11:54am
Pin a soldier to the billboard in chapter Highway 17.
Unlocked: May 20, 2013 11:33am
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
Unlocked: May 21, 2013 1:22pm
One Man Army
Destroy six gunships in Half-Life 2.
Unlocked: Jan 11, 2012 4:04pm
Survive the second turret standoff in Nova Prospekt.
Unlocked: Jan 11, 2012 4:24pm
Gain command of a squad of rebels in the uprising.
Unlocked: Jan 12, 2012 4:15pm
Radiation Levels Detected
Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked: Jan 17, 2012 1:18pm
Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked: Jan 18, 2012 1:29pm
Fight the Power
Shut down the supression device by disabling its generators.
Unlocked: Jan 25, 2012 1:12pm
Survive the rooftop strider battle in the ruins of City 17.
Unlocked: Feb 7, 2012 3:24pm
Destroy the Citadel's reactor core.
Break the mini-teleporter in Kleiner's lab.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Use DOG's ball to make a basket in Eli's scrapyard.
Play through Ravenholm using only the Gravity Gun.
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
Use the antlions to kill 50 enemies.
Kill an enemy with a toilet.
Kill all of the snipers in City 17.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Find all lambda caches in Half-Life 2.
Kill five enemies with a Manhack.