Survive the HECU infiltration and complete "We've Got Hostiles."
Kill 15 barnacles.
Destroy 5 turrets. (excludes ceiling mounted turrets)
Complete Office Complex.
Disengage the first turret in Office Complex.
In Office Complex, solve the chiller puzzle.
Conform to Eli's mission and complete Unforeseen Consequences.
Kill a scientist.
Witness (and indirectly cause) the Black Mesa Incident and complete Anomalous Materials.
In Anomalous Materials, refuse to put on the HEV Suit.
In Anomalous Materials, dry your hands.
Sit through the Tram Ride and complete Black Mesa Inbound.
Complete Uplink.
Complete the Hazard Course.
Welcome to Half-Life Legacy.
Complete Blast Pit.
Complete Apprenhension.
Complete the labyrinth that is Residue Processing.
Witness the dirty doings of the Black Mesa Research Facility and complete Questionable Ethics.
Survive the mortars and complete "Forget About Freeman."
Kill 500 headcrabs.
Kill 100 Alien Slaves. Don't worry, you'll come to regret this.
In Questionable Ethics, activate the steriliser.
In Surface Tension, destroy the first Apache.
In Surface Tension, destroy the second Apache after leaving the dam.
In Surface Tension, successfully dodge all the tripmines before descending.
In Surface Tension, destroy the third Apache on the cliffside.
In any desired order, complete the Hazard Course, Uplink, and Half-Life back to back. Doing them in one sitting is NOT required.
