01Achievements
Every Black Mesa achievement, ordered by how few players in the world have unlocked it.
15 of 50 entries
Prolific PopperKill all Protozoans in the Borderworld.2%Very rare
Pepperoni Precipitation—2%Very rare
Post-Mortem IntervalFind each member of the missing research teams.2.1%Very rare
The Rarest Specimen—2.1%Very rare
Unquestionably Ethical—2.4%Very rare
Laser ImmunizationComplete Interloper without taking any laser damage.2.5%Very rare
The Plan—2.6%Very rare
Rare SpecimenSend the Hidden Hat to Xen.2.9%Very rare
Specimen GGTake out all three Healing Crystals in Nihilanth’s Chamber at the same time.3.2%Very rare
Doctor’s SignatureDeliver the finishing blow to Gonarch with your Crowbar.3.3%Very rare
Late for WorkDefeat Nihilanth in under 4 minutes.3.4%Very rare
Black Mesa Decathlon WinnerEscape the Gargantua’s Lair without taking any damage from Gargantuas.3.7%Very rare
Orbital TrajectorySkip the opening Xen island with a secret jump.3.9%Very rare
Following the Rules—4%Very rare
xen when—4.5%Very rare
Data from Steam — Steam Web API Terms of Use. Last updated .