Here is the full list of all 33 Half-Life 2 achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Find all lambda caches in Half-Life 2.
Destroy six gunships in Half-Life 2.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Use DOG's ball to make a basket in Eli's scrapyard.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Pin a soldier to the billboard in chapter Highway 17.
Kill all of the snipers in City 17.
Use the antlions to kill 50 enemies.
Kill an enemy with a toilet.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Play through Ravenholm using only the Gravity Gun.
Survive the second turret standoff in Nova Prospekt.
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Kill five enemies with a Manhack.
Survive the rooftop strider battle in the ruins of City 17.
Shut down the supression device by disabling its generators.
Survive the generator plaza standoff in chapter Anticitizen One.
Get through the toxic tunnel under City 17 in Half-Life 2.
Gain command of a squad of rebels in the uprising.
Kill 3 enemies using the crane.
Get the Gravity Gun in Black Mesa East.
Destroy the hunter-chopper in Half-Life 2.
Break the mini-teleporter in Kleiner's lab.
Get the airboat's mounted gun.
Get the airboat.
Kill five barnacles with one barrel.
Get the crowbar.
Escape the apartment block raid.