chip

Defiant

Singularity Collapse

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.

Fight the Power

Shut down the supression device by disabling its generators.

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.

Follow Freeman

Gain command of a squad of rebels in the uprising.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

One Man Army

Destroy six gunships in Half-Life 2.

Bug Hunt

Use the antlions to kill 50 enemies.

Where Cubbage Fears to Tread

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Malcontent

Escape the apartment block raid.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Hallowed Ground

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Barnacle Bowling

Kill five barnacles with one barrel.

Heavy Weapons

Get the airboat's mounted gun.

Anchor's Aweigh!

Get the airboat.

Trusty Hardware

Get the crowbar.

Submissive

What cat?

Break the mini-teleporter in Kleiner's lab.

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.

Flushed

Kill an enemy with a toilet.

Counter-Sniper

Kill all of the snipers in City 17.

Lambda Locator

Find all lambda caches in Half-Life 2.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Hack Attack!

Kill five enemies with a Manhack.