Beat Unforeseen Consequences on Hard while only picking up the Crowbar.

"Cook" Dr. Magnusson's Microwave Casserole.

Die while testing the Anti-Mass Spectrometer.

Cause a Resonance Cascade. (Complete Anomalous Materials.)

Complete "We've Got Hostiles" in under 27:00 In-Game Time. (Quicksaves Allowed)

Now arriving at: Sector C Test Labs. (Complete Black Mesa Inbound)

Please get to the surface as soon as you can! (Complete Unforeseen Consequences on any difficulty.)

Gain access to the guard station in Unforeseen Consequences.

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 G-Man's offer.

Accept G-Man's offer.

Complete all tasks in the Black Mesa Hazard Course.

On a new save, beat Lambda Core on Hard within 02:00:00. (Quicksaves Allowed.) [In-Game Time] [Single Session]

Complete Unforeseen Consequences on Hard.

Complete Office Complex on Hard.

Complete We've Got Hostiles on Hard.

Complete Blast Pit on Hard.

Complete Nihilanth on Hard.

Complete Interloper on Hard.

Complete Gonarch's Lair on Hard.

Complete Xen on Hard.

Complete Lambda Core on Hard.

Complete "Forget About Freeman" on Hard.

Complete Surface Tension on Hard.

Complete Residue Processing on Hard.

Complete On A Rail on Hard.

Complete Apprehension on Hard.

Complete Questionable Ethics on Hard.

Complete Power Up on Hard.

After the first load zone, finish "On A Rail" without interacting with any trains. (Quicksaves Allowed)

Cheats Enabled, Achievements Disabled. (Unless Specified by Achievement.)

Complete "Lambda Core" as a Vortigaunt. (Alien Cheat Enabled.)

Have every weapon in your inventory at once.

Complete Half-Life: Uplink. [Read Description]

Complete Half-Life: Uplink on Hard. [Read Description]