| Logro | Descripción |
|---|
| Brownian Motion | Pass the toilet paper to the Scientist in need. |
| Convection Refinement | Ruin the microwave casserole. |
| Prophylactic Suggested | Get overtaken by a Headcrab's ample anterior. |
| Gray Matter Propulsion | Headshot 20 Enemies with the .357 Magnum. |
| Caffeine Extraction | Perform surgical caffeine extraction from 20 vending machines. |
| Premature Expulsion | Use an entire clip of Gluon ammo in one continuous shot. |
| Anti-Matter Over Mind | Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
| Inflammatory Actions | Kill a Headcrab using fire. |
| Limitless Potential | Accept G-Man?s offer of employment. |
| Centripetal Attraction | Kill 20 Enemies with the Hivehand. |
| Permeable Infrastructure | Use the alternate path in Office Complex. |
| Proverbial Tinkerer | Interfere with the alarm and laptop in Anomalous Materials. |
| Dead Reckoning | Kill an Assassin with the .357 Magnum. |
| Rather an Anticlimax | Decline G-Man?s offer of employment. |
| Calculated Trajectory | Kill 10 airborne Headcrabs using the Shotgun. |
| Mega Hertz | Kill 5 Enemies with one Grenade. |
| Quantum Capacitance | Overcharge it anyway. |
| Remote Detonation | Kill a Barnacle with a Satchel. |
| Digital Wizardry | Kill 10 enemies with a reprogrammed Sentry. |
| Universal Gravitation | Get killed by your own Snarks. |
| Contest Propellant | |
| PhD in Pacifism | Don't kill any Vortigaunts in the Borderworld. |
| Futile Resistance | Kill 10 Enemies with Snarks. |
| Nuclear Fishin' | Kill an Ichthyosaur with either the Tau or Gluon. |
| Resonance Procrastinator | Refuse to insert the specimen into the Anti-Mass Spectrometer. |
| Hyper Saturation Conundrum | Drown in Lambda Core's coolant. |
| Unified Coupling Theorum | Help the Barnacle and Headcrab find true love. |
| Kinetic Repulsion | Kill a Marine with their own Grenade. |
| One Step Ahead | Kill 10 Enemies with Tripmines??. |
| Less Than Desirable Consequences | Die in the AMS Beam before starting the experiment. |
| Well-Done | Cook a Grenade for too long. |
| Ethically Questionable | Conduct all of the questionable research experiments. |
| Stealth Technology | Escape the Hangar in Surface Tension without alerting the Soldiers. |
| Doctor?s Signature | Deliver the finishing blow to Gonarch with your Crowbar. |
| Rare Specimen | Send the Hidden Hat to Xen. |
| xen when | |
| Our Brains And Your Brawn | Assemble all the possible Scientists and Guards at the end of Office Complex. |
| Gonad Glider | Get whacked into oblivion in the ledge fight. |
| Specimen GG | Take out all three Healing Crystals in Nihilanth?s Chamber at the same time?. |
| Late for Work | Defeat Nihilanth in under 4 minutes.? |
| Orbital Trajectory | Skip the opening Xen island with a secret jump.? |
| Following the Rules | |
| Black Mesa Decathlon Winner | Escape the Gargantua?s Lair without taking any damage from Gargantuas. |
| Prolific Popper | Kill all Protozoans in the Borderworld. |
| The Rarest Specimen | |
| Post-Mortem Interval | Find each member of the missing research teams. |
| The Plan | |
| Unquestionably Ethical | |
| Laser Immunization | Complete Interloper without taking any laser damage. |
| Pepperoni Precipitation | |
