33 Achievements
Anchor's Aweigh! Get the airboat.
410 achievers
Atomizer Disintegrate 15 soldiers by throwing them into a Combine ball field.
143 achievers
Barnacle Bowling Kill five barnacles with one barrel.
306 achievers
Blast from the Past Find the HEV Suit Charger faceplate in Eli's scrapyard.
296 achievers
Bug Hunt Use the antlions to kill 50 enemies.
244 achievers
Counter-Sniper Kill all of the snipers in City 17.
104 achievers
Defiant Hit the trashcan cop with the can.
290 achievers
Fight the Power Shut down the supression device by disabling its generators.
211 achievers
Flushed Kill an enemy with a toilet.
100 achievers
Follow Freeman Gain command of a squad of rebels in the uprising.
238 achievers
Giant Killer Survive the rooftop strider battle in the ruins of City 17.
205 achievers
Hack Attack! Kill five enemies with a Manhack.
97 achievers
Hallowed Ground Escort Gregori safely through the church cemetery.
306 achievers
Heavy Weapons Get the airboat's mounted gun.
364 achievers
Keep Off the Sand! Cross the antlion beach in chapter Sandtraps without touching the sand.
69 achievers
Lambda Locator Find all lambda caches in Half-Life 2.
47 achievers
Malcontent Escape the apartment block raid.
523 achievers
One Man Army Destroy six gunships in Half-Life 2.
206 achievers
OSHA Violation Kill 3 enemies using the crane.
209 achievers
Plaza Defender Survive the generator plaza standoff in chapter Anticitizen One.
230 achievers
Radiation Levels Detected Get through the toxic tunnel under City 17 in Half-Life 2.
232 achievers
Revenge! Destroy the hunter-chopper in Half-Life 2.
355 achievers
Singularity Collapse Destroy the Citadel's reactor core.
210 achievers
Submissive Put the can in the trash.
366 achievers
Targetted Advertising Pin a soldier to the billboard in chapter Highway 17.
157 achievers
Trusty Hardware Get the crowbar.
506 achievers
Two Points Use DOG's ball to make a basket in Eli's scrapyard.
122 achievers
Vorticough Discover the hidden singing vortigaunt cave in chapter Water Hazard.
125 achievers
Warden Freeman Survive the second turret standoff in Nova Prospekt.
229 achievers
What cat? Break the mini-teleporter in Kleiner's lab.
201 achievers
Where Cubbage Fears to Tread Defend Little Odessa from the gunship attack.
288 achievers
Zero-Point Energy Get the Gravity Gun in Black Mesa East.
352 achievers
Zombie Chopper Play through Ravenholm using only the Gravity Gun.
93 achievers