Kill a Combine Heavy while their shield is up.
Use the multitool to hack a tripmine.
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.
Collect the SMG.
Install your first pistol upgrade.
Collect the shotgun.
Receive a tasty treat.
Break open a supply crate with your hands.
Loot a corpse.
Feed the snark.
Pick up and smash 50 glass bottles.
Interact with the playground somehow.
Test your grip on a headcrab heart.
Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
Kill a grunt by shooting their gas tank.
Use the gravity gloves to loot an item off a living Combine soldier.
Snatch a Xen grenade from its resting place.
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