Heavy Weapons
Not unlocked yetGet the airboat's mounted gun.
Trusty Hardware
Not unlocked yetGet the crowbar.
Zero-Point Energy
Not unlocked yetGet the Gravity Gun in Black Mesa East.
Defiant
Not unlocked yetHit the trashcan cop with the can.
Counter-Sniper
Not unlocked yetKill all of the snipers in City 17.
Barnacle Bowling
Not unlocked yetKill five barnacles with one barrel.
Revenge!
Not unlocked yetDestroy the hunter-chopper in Half-Life 2.
Bug Hunt
Not unlocked yetUse the antlions to kill 50 enemies.
OSHA Violation
Not unlocked yetKill 3 enemies using the crane.
Flushed
Not unlocked yetKill an enemy with a toilet.
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.
Two Points
Not unlocked yetUse DOG's ball to make a basket in Eli's scrapyard.
Targetted Advertising
Not unlocked yetPin a soldier to the billboard in chapter Highway 17.
Submissive
Not unlocked yetPut the can in the trash.
Think Fast!
Not unlocked yetKill an Elite Soldier with his own energy ball.
Hack Attack!
Not unlocked yetKill five enemies with a Manhack.
Conservationist
Not unlocked yetKill five enemies with the same energy ball.
Bone Breaker
Not unlocked yetKill 30 enemies with thrown physics objects.
Deadly Harvest
Not unlocked yetKill an enemy by planting a hopper mine.
Hot Potat0wned
Not unlocked yetKill a Combine soldier with his own grenade.