Queiroz

Anchor's Aweigh!

Get the airboat.

Defiant

Submissive

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.

Trusty Hardware

Get the crowbar.

Barnacle Bowling

Kill five barnacles with one barrel.

Heavy Weapons

Get the airboat's mounted gun.

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Blast from the Past

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

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Two Points

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

Hallowed Ground

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

Where Cubbage Fears to Tread

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.

Bug Hunt

Use the antlions to kill 50 enemies.

Flushed

Kill an enemy with a toilet.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

Follow Freeman

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.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Counter-Sniper

Kill all of the snipers in City 17.

Fight the Power

Shut down the supression device by disabling its generators.

Giant Killer

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

Atomizer

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

Singularity Collapse

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.