Malcontent
Escape the apartment block raid.
9.3%
Trusty Hardware
Get the crowbar.
8.8%
Anchor's Aweigh!
Get the airboat.
6.5%
Heavy Weapons
Get the airboat's mounted gun.
5.7%
Revenge!
Destroy the hunter-chopper in Half-Life 2.
5.5%
Zero-Point Energy
Get the Gravity Gun in Black Mesa East.
5.4%
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
5.4%
Barnacle Bowling
Kill five barnacles with one barrel.
5.2%
Hallowed Ground
Escort Gregori safely through the church cemetery.
4.5%
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
4.4%
Bug Hunt
Use the antlions to kill 50 enemies.
3.7%
Follow Freeman
Gain command of a squad of rebels in the uprising.
3.5%
Warden Freeman
Survive the second turret standoff in Nova Prospekt.
3.4%
Radiation Levels Detected
Get through the toxic tunnel under City 17 in Half-Life 2.
3.3%
OSHA Violation
Kill 3 enemies using the crane.
3.2%
Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One.
3.2%
One Man Army
Destroy six gunships in Half-Life 2.
3.1%
Fight the Power
Shut down the supression device by disabling its generators.
3.1%
Giant Killer
Survive the rooftop strider battle in the ruins of City 17.
2.9%
Singularity Collapse
Destroy the Citadel's reactor core.
2.8%
Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17.
2.4%
What cat?
Break the mini-teleporter in Kleiner's lab.
2.2%
Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field.
1.6%
Vorticough
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
1.3%
Two Points
Use DOG's ball to make a basket in Eli's scrapyard.
1.3%
Counter-Sniper
Kill all of the snipers in City 17.
1.2%
Flushed
Kill an enemy with a toilet.
1.0%
Hack Attack!
Kill five enemies with a Manhack.
0.9%
Zombie Chopper
Play through Ravenholm using only the Gravity Gun.
0.9%
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
0.6%
Lambda Locator
Find all lambda caches in Half-Life 2.
0.2%