Steal a Zombine's grenade.
Defeat both antlion guards outside the White Forest.
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Kill an enemy by planting a hopper mine.
Kill an acid antlion worker.
Send the garden gnome into space.
Kill a Combine soldier with his own grenade.
Kill 30 enemies with thrown physics objects.
Kill a Hunter with its own flechettes.
Save the missile silo from the Combine offensive.
Save all buildings outside the missile silo from destruction.
Secure the launch doors on missile silo 2.
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Survive the ambush at White Forest Inn.
Squish every antlion grub in Episode Two.
Beat DOG in a race to the White Forest base.
Find every radar cache in chapter Under The Radar.
Destroy the Combine Autogun in the junkyard.
Defeat the chopper in Episode Two without any misses.
Survive the Hunter ambush with Alyx.
Run over 20 enemies with the car in Episode Two.
Find and break every web cache in Episode Two.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space. If you did not also receive the achievement 'Manufacturing Ascent', Newell has abandoned his plans to shoot Noam Chomsky into space.
29
97
756
140
82
15
0
0