Find the HEV Suit Charger faceplate in Eli's scrapyard.
Get the Gravity Gun in Black Mesa East.
Destroy the Hunter-Chopper.
Get the Airboat's mounted gun.
Get the Airboat.
Get the crowbar.
Escape the apartment block raid.
Survive the rooftop Strider battle in the ruins of City 17.
Cross the antlion beach in Sandtraps without touching the sand.
Survive the Generator Plaza standoff in Anticitizen One.
Beat Ravenholm using only the Gravgun.
Shut down the supression device by disabling its generators.
Get through the toxic tunnel under City 17.
Survive the second turret standoff in Nova Prospekt.
Break the mini-teleporter in Kleiner's lab.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Find all of the lambda caches.
Discover the hidden singing vortigaunt cave in Water Hazard.
Gain command of a squad of rebels in the uprising.
Kill five enemies with Manhacks.
Kill all of the snipers in Follow Freeman.
Kill five barnacles with one explosive barrel.
Use the Antlions to kill 50 enemies.
Kill 3 enemies using the crane.
Kill an enemy with a toilet.
Destroy six Gunships
Make a basket in Eli's scrapyard.
Pin the soldier to the billboard with the Crossbow in Highway 17.
2691
24715
