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