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Counter-Sniper
11.1%Kill all of the snipers in City 17.
Unlocked
OSHA Violation
21.7%Kill 3 enemies using the crane.
Unlocked
Singularity Collapse
26.4%Unlocked
Atomizer
12.6%Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked
Giant Killer
27.0%Survive the rooftop strider battle in the ruins of City 17.
Unlocked
Fight the Power
28.0%Shut down the supression device by disabling its generators.
Unlocked
Plaza Defender
29.4%Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked
Radiation Levels Detected
30.0%Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked
Follow Freeman
30.7%Gain command of a squad of rebels in the uprising.
Unlocked
Warden Freeman
30.8%Survive the second turret standoff in Nova Prospekt.
Unlocked
Bug Hunt
31.8%Use the antlions to kill 50 enemies.
Unlocked
One Man Army
27.9%Destroy six gunships in Half-Life 2.
Unlocked
Where Cubbage Fears to Tread
37.2%Unlocked
Hallowed Ground
38.7%Unlocked
Zero-Point Energy
43.1%Get the Gravity Gun in Black Mesa East.
Unlocked
Blast from the Past
20.1%Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked
Revenge!
43.9%Destroy the hunter-chopper in Half-Life 2.
Unlocked
Heavy Weapons
46.2%Get the airboat's mounted gun.
Unlocked
Anchor's Aweigh!
52.5%Get the airboat.
Unlocked
Barnacle Bowling
37.1%Kill five barnacles with one barrel.
Unlocked
