| Picture
| Name | Description |  |
| Hack Attack! | Kill five enemies with a Manhack. | 5
|
| Conservationist | Kill five enemies with the same energy ball. | 5
|
| Think Fast! | Kill an Elite Soldier with his own energy ball. | 10
|
| Submissive | Put the can in the trash. | 5
|
| Defiant | Hit the trashcan cop with the can. | 5
|
| Zombie-que | Use flares to light 15 zombies on fire. | 5
|
| Malcontent | Escape the apartment block raid. | 5
|
| What cat? | Break the mini-teleporter in Kleiner's lab. | 5
|
| Trusty Hardware | Get the crowbar. | 5
|
| Barnacle Bowling | Kill five barnacles with one barrel. | 5
|
| Anchor's Aweigh! | Get the airboat. | 5
|
| Heavy Weapons | Get the airboat's mounted gun. | 5
|
| Vorticough | Discover the hidden singing vortigaunt cave in chapter Water Hazard. | 13
|
| Revenge! | Destroy the hunter-chopper in Half-Life 2. | 10
|
| Blast from the Past | Find the HEV Suit Charger faceplate in Eli's scrapyard. | 10
|
| Zero-Point Energy | Get the gravity gun in Black Mesa East. | 5
|
| Two Points | Use DOG's ball to make a basket in Eli's scrapyard. | 2
|
| Zombie Chopper | Play through Ravenholm using only the gravity gun. | 25
|
| Hallowed Ground | Escort Gregori safely through the church cemetery. | 5
|
| OSHA Violation | Kill 3 enemies using the crane. | 5
|
| Targeted Advertising | Pin a soldier to the billboard in chapter Highway 17. | 5
|
| Where Cubbage Fears to Tread | Defend Little Odessa from the gunship attack. | 5
|
| One Man Army | Destroy six gunships in Half-Life 2. | 5
|
| Keep Off the Sand! | Cross the antlion beach in chapter Sandtraps without touching the sand. | 20
|
| Bug Hunt | Use the antlions to kill 50 enemies. | 10
|
| Flushed | Kill an enemy with a toilet. | 5
|
| Warden Freeman | Survive the second turret standoff in Nova Prospekt. | 10
|
| "Radiation Levels Detected" | Get through the toxic tunnel under City 17 in Half-Life 2. | 5
|
| Plaza Defender | Survive the generator plaza standoff in chapter Anticitizen One. | 10
|
| Counter-Sniper | Kill all of the snipers in City 17. | 5
|
| Fight the Power | Shut down the suppression device by disabling its generators. | 10
|
| Giant Killer | Survive the rooftop strider battle in the ruins of City 17. | 10
|
| Singularity Collapse | Destroy the Citadel's reactor core. | 25
|
| Lambda Locator | Find all lambda caches in Half-Life 2. | 15
|
| Atomizer | Disintegrate 15 soldiers by throwing them into a Combine ball field. | 10
|
| Follow Freeman | Gain command of a squad of rebels in the uprising. | 10
|