Test your grip on a headcrab heart.
On a Roll
Interact with the playground somehow.
Kill a Combine Heavy while their shield is up.
Use the gravity gloves to intercept an incoming enemy grenade in mid-flight.
Use the gravity gloves to loot an item off a living Combine soldier.
Pick up and smash 50 glass bottles.
Snatch a Xen grenade from its resting place.
Use the multitool to hack a tripmine.
Kill a grunt by shooting their gas tank.
Collect the SMG.
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.
Feed the snark.