Kill an acid antlion worker.
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Defeat both antlion guards outside the White Forest.
Meet the Hunters
Survive the Hunter ambush with Alyx.
Destroy the Combine Autogun in the junkyard.
Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
Secondary Silo Secured
Secure the launch doors on missile silo 2.
Kill an enemy by planting a hopper mine.
Defense of the Armament
Save the missile silo from the Combine offensive.
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Find every radar cache in chapter Under The Radar.
Steal a Zombine's grenade.
Hit and Run
Run over 20 enemies with the car in Episode Two.
Pedal to the Metal
Beat DOG in a race to the White Forest base.
Kill 30 enemies with thrown physics objects.
Kill a Hunter with its own flechettes.
Find and break every web cache in Episode Two.
Puttin' On a Clinic
Defeat the chopper in Episode Two without any misses.
Kill a Combine soldier with his own grenade.
Little Rocket Man
Send the garden gnome into space.
Save all buildings outside the missile silo from destruction.
Get Some Grub
Squish every antlion grub in Episode Two.