Black Mesa
Halfzombie
Playtime
42.3h
Completed
Oct 7, 2026
Achievements
9/50
18% complete
All Achievements
Mega Hertz
Kill 5 Enemies with one Grenade.
18.8%
Oct 20, 2021
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
12.3%
Oct 20, 2021
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
36.8%
Oct 12, 2021
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
10.8%
Oct 9, 2021
Centripetal Attraction
Kill 20 Enemies with the Hivehand.
22.8%
Oct 8, 2021
Dead Reckoning
Kill an Assassin with the .357 Magnum.
23.2%
Oct 5, 2021
Remote Detonation
Kill a Barnacle with a Satchel.
11.2%
Oct 5, 2021
Permeable Infrastructure
Use the alternate path in Office Complex.
23.4%
Sep 23, 2021
Brownian Motion
Pass the toilet paper to the Scientist in need.
61.1%
Sep 20, 2021
Pepperoni Precipitation
2%
Locked
Prolific Popper
Kill all Protozoans in the Borderworld.
2.1%
Locked
The Rarest Specimen
2.1%
Locked
Post-Mortem Interval
Find each member of the missing research teams.
2.1%
Locked
Unquestionably Ethical
2.4%
Locked
Laser Immunization
Complete Interloper without taking any laser damage.
2.5%
Locked
The Plan
2.6%
Locked
Rare Specimen
Send the Hidden Hat to Xen.
2.9%
Locked
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
3.2%
Locked
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
3.3%
Locked
Late for Work
Defeat Nihilanth in under 4 minutes.
3.4%
Locked
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
3.7%
Locked
Orbital Trajectory
Skip the opening Xen island with a secret jump.
3.9%
Locked
Following the Rules
4%
Locked
xen when
4.6%
Locked
Ethically Questionable
Conduct all of the questionable research experiments.
5.3%
Locked
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
5.3%
Locked
Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
6%
Locked
Gonad Glider
Get whacked into oblivion in the ledge fight.
6%
Locked
Kinetic Repulsion
Kill a Marine with their own Grenade.
6.1%
Locked
One Step Ahead
Kill 10 Enemies with Tripmines.
6.1%
Locked
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
6.5%
Locked
Futile Resistance
Kill 10 Enemies with Snarks.
7.1%
Locked
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
8.9%
Locked
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
9.6%
Locked
Universal Gravitation
Get killed by your own Snarks.
10.7%
Locked
Contest Propellant
10.9%
Locked
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
11.9%
Locked
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
13.5%
Locked
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
15.7%
Locked
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
16.4%
Locked
Rather an Anticlimax
Decline G-Man’s offer of employment.
16.7%
Locked
Quantum Capacitance
Overcharge it anyway.
18.8%
Locked
Well-Done
Cook a Grenade for too long.
19%
Locked
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
21%
Locked
Limitless Potential
Accept G-Man’s offer of employment.
25.2%
Locked
Inflammatory Actions
Kill a Headcrab using fire.
25.7%
Locked
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
26.6%
Locked
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
27.9%
Locked
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
33.3%
Locked
Convection Refinement
Ruin the microwave casserole.
50.3%
Locked