Conservationist
Kill five enemies with the same energy ball.
Think Fast!
Kill an Elite Soldier with his own energy ball.
Acid Reflex
Kill an acid antlion worker.
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Twofer
Defeat both antlion guards outside the White Forest.
Hit and Run
Run over 20 enemies with the car in Episode Two.
Meet the Hunters
Survive the Hunter ambush with Alyx.
Gunishment!
Destroy the Combine Autogun in the junkyard.
Pedal to the Metal
Beat DOG in a race to the White Forest base.
Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
Secondary Silo Secured
Secure the launch doors on missile silo 2.
Defense of the Armament
Save the missile silo from the Combine offensive.
Gnome Alone
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.
Tomorrow
Ending reached
Compounding interest
Reach a prestige multiplier of 10 in endless mode.
My name shall be known
Win a prestige run with 1000 points or more.
Bringing home the big bucks
Gain 200 prestige in one wave.
Close Call
🔒 Hidden Achievement
Learning Opportunity
🔒 Hidden Achievement
My Savior
🔒 Hidden Achievement