Defiant
Not unlocked yetHit the trashcan cop with the can.
Submissive
Not unlocked yetPut the can in the trash.
Malcontent
Not unlocked yetEscape the apartment block raid.
What cat?
Not unlocked yetBreak the mini-teleporter in Kleiner's lab.
Trusty Hardware
Not unlocked yetGet the crowbar.
Barnacle Bowling
Not unlocked yetKill five barnacles with one barrel.
Anchor's Aweigh!
Not unlocked yetGet the airboat.
Heavy Weapons
Not unlocked yetGet the airboat's mounted gun.
Vorticough
Not unlocked yetDiscover the hidden singing vortigaunt cave in chapter Water Hazard.
Revenge!
Not unlocked yetDestroy the hunter-chopper in Half-Life 2.
Blast from the Past
Not unlocked yetFind the HEV Suit Charger faceplate in Eli's scrapyard.
Zero-Point Energy
Not unlocked yetGet the Gravity Gun in Black Mesa East.
Two Points
Not unlocked yetUse DOG's ball to make a basket in Eli's scrapyard.
Zombie Chopper
Not unlocked yetPlay through Ravenholm using only the Gravity Gun.
Hallowed Ground
Not unlocked yetEscort Gregori safely through the church cemetery.
OSHA Violation
Not unlocked yetKill 3 enemies using the crane.
Targetted Advertising
Not unlocked yetPin a soldier to the billboard in chapter Highway 17.
Where Cubbage Fears to Tread
Not unlocked yetDefend Little Odessa from the gunship attack.
One Man Army
Not unlocked yetDestroy six gunships in Half-Life 2.
Keep Off the Sand!
Not unlocked yetCross the antlion beach in chapter Sandtraps without touching the sand.
Bug Hunt
Not unlocked yetUse the antlions to kill 50 enemies.
Flushed
Not unlocked yetKill an enemy with a toilet.
Warden Freeman
Not unlocked yetSurvive the second turret standoff in Nova Prospekt.
Follow Freeman
Not unlocked yetGain command of a squad of rebels in the uprising.