Black Mesa/Achievements
Black Mesa achievements by rarity
Global completion percentages from Steam, rarest first
Achievements
50
Rarest
2.0%
Ultra rare (<5%)
15
Avg. completion
13%
1
Prolific Popper
Kill all Protozoans in the Borderworld.
2.0%
2
Pepperoni Precipitationhidden
Hidden achievement — description revealed on unlock.
2.0%
3
The Rarest Specimenhidden
Hidden achievement — description revealed on unlock.
2.1%
4
Post-Mortem Interval
Find each member of the missing research teams.
2.1%
5
Unquestionably Ethicalhidden
Hidden achievement — description revealed on unlock.
2.4%
6
The Planhidden
Hidden achievement — description revealed on unlock.
2.5%
7
Laser Immunization
Complete Interloper without taking any laser damage.
2.5%
8
Rare Specimen
Send the Hidden Hat to Xen.
2.9%
9
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
3.2%
10
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
3.3%
11
Late for Work
Defeat Nihilanth in under 4 minutes.
3.3%
12
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
3.7%
13
Orbital Trajectory
Skip the opening Xen island with a secret jump.
3.8%
14
Following the Ruleshidden
Hidden achievement — description revealed on unlock.
3.9%
15
xen whenhidden
Hidden achievement — description revealed on unlock.
4.5%
16
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
5.2%
17
Ethically Questionable
Conduct all of the questionable research experiments.
5.3%
18
Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
5.9%
19
Gonad Glider
Get whacked into oblivion in the ledge fight.
5.9%
20
Kinetic Repulsion
Kill a Marine with their own Grenade.
6.0%
21
One Step Ahead
Kill 10 Enemies with Tripmines.
6.0%
22
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
6.4%
23
Futile Resistance
Kill 10 Enemies with Snarks.
7.0%
24
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
8.8%
25
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
9.5%
26
Universal Gravitation
Get killed by your own Snarks.
11%
27
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
11%
28
Contest Propellanthidden
Hidden achievement — description revealed on unlock.
11%
29
Remote Detonation
Kill a Barnacle with a Satchel.
11%
30
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
12%
31
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
12%
32
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
13%
33
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
16%
34
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
16%
35
Rather an Anticlimax
Decline G-Man’s offer of employment.
17%
36
Mega Hertz
Kill 5 Enemies with one Grenade.
19%
37
Quantum Capacitance
Overcharge it anyway.
19%
38
Well-Done
Cook a Grenade for too long.
19%
39
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
21%
40
Centripetal Attraction
Kill 20 Enemies with the Hivehand.
23%
41
Dead Reckoning
Kill an Assassin with the .357 Magnum.
23%
42
Permeable Infrastructure
Use the alternate path in Office Complex.
23%
43
Limitless Potential
Accept G-Man’s offer of employment.
25%
44
Inflammatory Actions
Kill a Headcrab using fire.
26%
45
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
26%
46
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
28%
47
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
33%
48
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
37%
49
Convection Refinement
Ruin the microwave casserole.
50%
50
Brownian Motion
Pass the toilet paper to the Scientist in need.
61%
Percentages are Steam's global unlock rates across all players who own Black Mesa, refreshed daily. See live player counts and stats for Black Mesa.