Unlocked: Dec 28, 2012 10:27am
Hit the trashcan cop with the can.
Unlocked: Dec 28, 2012 10:31am
Escape the apartment block raid.
Unlocked: Dec 28, 2012 10:43am
Get the crowbar.
Unlocked: Dec 31, 2012 1:07pm
Get the airboat.
Unlocked: Dec 31, 2012 1:39pm
Get the airboat's mounted gun.
Unlocked: Dec 31, 2012 1:50pm
Destroy the hunter-chopper in Half-Life 2.
Unlocked: Dec 31, 2012 2:08pm
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked: Dec 31, 2012 2:09pm
Get the Gravity Gun in Black Mesa East.
Unlocked: Dec 31, 2012 2:54pm
Escort Gregori safely through the church cemetery.
Unlocked: Dec 31, 2012 3:15pm
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
Break the mini-teleporter in Kleiner's lab.
Kill five barnacles with one barrel.
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.
Kill 3 enemies using the crane.
Pin a soldier to the billboard in chapter Highway 17.
One Man Army
Destroy six gunships in Half-Life 2.
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.
Survive the second turret standoff in Nova Prospekt.
Gain command of a squad of rebels in the uprising.
Radiation Levels Detected
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.
Fight the Power
Shut down the supression device by disabling its generators.
Survive the rooftop strider battle in the ruins of 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.