<br><table width='100%' cellpadding=3 cellspacing=3 border=0><tr valign='top'><th>Achievement</th><th>How to unlock
</th></tr><tr valign='top'><td>Brownian Motion</td><td>Pass the toilet paper to the scientist in need.
</td></tr><tr valign='top'><td>Caffeine Extraction</td><td>Perform surgical caffeine extraction from 20 machines.
</td></tr><tr valign='top'><td>Calculated Trajectory</td><td>Kill 10 Airborne Headcrabs using the Shotgun.
</td></tr><tr valign='top'><td>Centripetal Attraction</td><td>Kill 20 enemies with the Hivehand.
</td></tr><tr valign='top'><td>Convection Refinement</td><td>Ruin the microwave casserole.
</td></tr><tr valign='top'><td>Dead Reckoning</td><td>Kill an Assassin with the .357 Magnum.
</td></tr><tr valign='top'><td>Digital Wizardry</td><td>Kill 10 enemies with a reprogrammed Sentry.
</td></tr><tr valign='top'><td>Ethically Questionable</td><td>Conduct all of the questionable research experiments.
</td></tr><tr valign='top'><td>Futile Resistance</td><td>Kill 10 enemies with Snarks.
</td></tr><tr valign='top'><td>Gray Matter Propulsion</td><td>Headshot 20 enemies with the .357 magnum.
</td></tr><tr valign='top'><td>Hyper Saturation Conundrum</td><td>Drown in Lambda Core's coolant.
</td></tr><tr valign='top'><td>Inflammatory Actions</td><td>Kill a Headcrab using fire.
</td></tr><tr valign='top'><td>Kinetic Repulsion</td><td>Kill a Marine with their own grenade.
</td></tr><tr valign='top'><td>Mega Hertz</td><td>Kill 5 enemies with one grenade.
</td></tr><tr valign='top'><td>Nuclear Fishin'</td><td>Kill an Icthyosaur with either the Tau or Gluon.
</td></tr><tr valign='top'><td>Permeable Infrastructure</td><td>Use the alternate path in Office Complex.
</td></tr><tr valign='top'><td>Premature Expulsion</td><td>Use an entire clip of Gluon ammo in one continuous shot.
</td></tr><tr valign='top'><td>Prophylactic Suggested</td><td>Get overtaken by a Headcrab's ample anterior.
</td></tr><tr valign='top'><td>Proverbial Tinkerer</td><td>Interfere with the alarm and laptop in Anomalous Materials.
</td></tr><tr valign='top'><td>Quantum Capacitance</td><td>Overcharge it anyway.
</td></tr><tr valign='top'><td>Rare Specimen</td><td>Send the Hidden Hat to Xen.
</td></tr><tr valign='top'><td>Remote Detonation</td><td>Kill a Barnacle with a Satchel.
</td></tr><tr valign='top'><td>Resonance Procrastinator</td><td>Refuse to insert the specimen into the Anti-Mass Spectrometer.
</td></tr><tr valign='top'><td>Unified Coupling Theorum</td><td>Help the Barnacle and Headcrab find true love.
</td></tr><tr valign='top'><td>Universal Gravitation</td><td>Get killed by your own Snarks.
</td></tr></table>