In this guide I will only show all the achievements of Black Mesa with their respective Descriptions, including the new achievements of the 1.0 update.
Black Mesa Xen Achievements Guide
I discovered that some achievements are Bug, I mean they didn’t come out doing the thing that says in the description like the “Rather an Anticlimax”, “PhD in Pacifism” and “Limitless Potential”, that the truth until I finished Xen to see if the two achievements of the G-Man finals came out, but nothing.
So before someone asks me “how did I get the descriptions of hidden achievements / new achievements?”, I took it out with an external program.
All Achievements Before Version 1.0
Pass the toilet paper to the Scientist in need.
Ruin the microwave casserole.
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
Get overtaken by a Headcrab’s ample anterior.
Perform surgical caffeine extraction from 20 vending machines.
Kill 20 Enemies with the Hivehand.
Use the alternate path in Office Complex.
Overcharge it anyway.
Kill a Headcrab using fire.
Interfere with the alarm and laptop in Anomalous Materials.
Kill an Assassin with the .357 Magnum.
Kill 5 Enemies with one Grenade.
Use an entire clip of Gluon ammo in one continuous shot.
Get killed by your own Snarks.
Kill 10 airborne Headcrabs using the Shotgun.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Kill a Barnacle with a Satchel.
Kill an Ichthyosaur with either the Tau or Gluon.
Kill 10 enemies with a reprogrammed Sentry.
Kill 10 Enemies with Snarks.
Hyper Saturation Conundrum
Drown in Lambda Core’s coolant.
Conduct all of the questionable research experiments.
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
Kill a Marine with their own Grenade.
Send the Hidden Hat to Xen.
All New Achievements of Version 1.0
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Don’t use the Cyanogen and let the Gonarch live.
Find the snack supply canister.
Complete Interloper without taking any laser damage.
Rather an Anticlimax
Decline G-Man´s offer of employment.
Black Mesa Decathlon Winner
Escape the Gargantua´s Lair without taking any damage from Gargantuas.
Take out all three Healing Crystals in Nihilanth´s Chamber at the same time.
Late for Work
Defeat Nihilanth in under 4 minutes.
Accept G-Man´s offer of employment.
Find each member of the missing research teams.
Use Cyanogen to kill Gonarch.
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
Get whacked into oblivion in the ledge fight.
Deliver the finishing blow to Gonarch with your Crowbar.
Following the Rules
Use the welcome mat.
Skip the opening Xen island with a secret jump.
Less Than Desirable Consequences
Die in the Test Chamber before starting the experiment.
Wait too long to jump into the Lambda Teleporter.
Escape the Hander in Surface Tension without alerting the Soldiers.
One Step Ahead
Kill 10 Enemies with Tripmines.
The Rarest Specimen
Carry the Hidden Hat to Endgame.
PhD in Pacifism
Don’t kill any Vortigaunts in the Borderworld.
Kill all Protozoans in the Borderworld.
View the “other” secret ending.
Cook a Grenade for too long.