Die while testing the Anti-Mass Spectrometer
Cause a Resonance Cascade. (Complete "Anomalous Materials" on any difficulty)
Complete "We've Got Hostiles" in under 27:00 In-Game Time. (Quicksaves are allowed)
Now arriving at: Sector C Test Labs. (Complete "Black Mesa Inbound" on any difficulty)
Please get to the surface as soon as you can! (Complete "Unforeseen Consequences" on any difficulty)
What if the world finds out what we were doing down here..? (Complete "Office Complex" on any difficulty)
They're coming for us, it's our only way out! (Complete "We've Got Hostiles" on any difficulty)
Be quiet. This thing hears us. (Complete "Blast Pit" on any difficulty)
That train'll take us to the surface... (Complete "Power Up" on any difficulty)
Oh yeah, he'll pay. He will definitely pay. (Complete "On A Rail" on any difficulty)
We got 'im. Let's kill him now! (Complete "Apprehension" on any difficulty)
Work safe, work smart. Your future depends on it. (Complete "Residue Processing" on any difficulty)
I'm warning you, it's hell out there... (Complete "Questionable Ethics" on any difficulty)
Come in! Cooper, do you copy? (Complete "Surface Tension" on any difficulty)
We are cutting our losses and pulling out! (Complete "Forget About Freeman" on any difficulty)
It's ready! You must go, now! (Complete "Lambda Core" on any difficulty)
If you don't wipe it out, there won't be much for you to come home to... (Complete "Xen" on any difficulty)
Can you imagine what the next stage of mutation looks like? (Complete "Gonarch's Lair" on any difficulty)
The last... I am the last... (Complete "Interloper" on any difficulty)
...? (Complete "Nihilanth" on any difficulty)
Decline the G-Man's offer
Accept the G-Man's offer
Complete all tasks in the Black Mesa Hazard Course
On a new save, beat "Lambda Core" on Difficult in a single session within 2 hours of in-game time. (Quicksaves are allowed)
Complete "Unforeseen Consequences" on Difficult
Complete "Office Complex" on Difficult
Complete "We've Got Hostiles" on Difficult
Complete "Blast Pit" on Difficult
Complete "Nihilanth" on Difficult
Complete "Interloper" on Difficult
Complete "Gonarch's Lair" on Difficult
Complete "Xen" on Difficult
Complete "Lambda Core" on Difficult
Complete "Forget About Freeman" on Difficult
Complete "Surface Tension" on Difficult
Complete "Residue Processing" on Difficult
Complete "On A Rail" on Difficult
Complete "Apprehension" on Difficult
Complete "Questionable Ethics" on Difficult
Complete "Power Up" on Difficult
After the first load zone, finish "On A Rail" without interacting with any trains (Quicksaves are allowed)
Cheats enabled means achievements disabled unless specified otherwise by achievement
Complete "Lambda Core" as a Vortigaunt with the Alien cheat enabled
Have every weapon in your inventory at once
Complete Half-Life: Uplink
Complete Half-Life: Uplink on Hard
Witness the Resonance Cascade through Gina Cross and Colette Green's eyes
"This is a Resonance Cascade, Dr. Rosenberg..." (Complete "Dual Access")
Complete "Dual Access" with both Gina and Colette achieving an A Grade
Complete "Dual Access" with all Kills and 100% Accuracy with both Gina and Colette
In "Dual Access", have 60% Suit charge in Single Player, or as Gina in Co-op
"Hello, and welcome to the Black Mesa Hazard Course!" (Complete "Hazardous Course")
Complete "Hazardous Course" with both Gina and Colette achieving an A Grade
Complete "Hazardous Course" with all kills
"Dr. Keller? Dr. Keller? Do you read me?" (Complete "Surface Call")
Complete "Surface Call" with both Gina and Colette achieving an A Grade
"You must reset the lock now!" (Complete "Resonance")
In "Domestic Violence", obtain a Snark from an unfortunate security guard
"It's our only chance!" (Complete "Crossfire")
"Thieves... You are all... Thieves!" (Complete "Xen Attacks")
Complete "Domestic Violence" with both Gina and Colette achieving an A Grade
"You'll have to unlock them from inside..." (Complete "Code Green")
Complete "Code Green" with both Gina and Colette achieving an A Grade
"We must act, now!" (Complete "Intensity")
Complete "Intensity" with both Gina and Colette achieving an A Grade
Complete "Rift" with both Gina and Colette achieving an A Grade
"Protect the beacon at all costs!" (Complete "Rift")
After restarting your game, load up "Intensity" and have Dr. Keller tell you to do stuff
Complete "Resonance" with both Gina and Colette achieving an A Grade
"The dimensional rift must be sealed!" (Complete "Domestic Violence")
Complete "Crossfire" with both Gina and Colette achieving an A Grade
Complete "Xen Attacks" with both Drone X-8973 and Drone R-4913 achieving an A Grade