Establish Communications
Quake II: Establish a communication link to the command ship
Destroy Strogg Logistical Train
Quake II: Destroy the Strogg logistical train and restore power to key warehouse components
Destroy Security Grid
Quake II: Enter the security pyramid and destroy the security grid protecting the industrial region
Navigate the Mines
Quake II: Navigate the mines to find a service entrance to the factory
Shut Down Processing Plant
Quake II: Shut down all machines in the Strogg processing plant
Destroy Strogg Main Reactor
Quake II: Infiltrate and destroy Strogg main reactor
Destroy the Big Gun
Quake II: Find and destroy the Strogg's planetary defense system, the Big Gun
Destroy Black Hole Generator
Quake II: Close main hangar bay door and destroy the Black Hole Generator
Assassinate the Makron
Quake II: Neutralize Strogg leader's communication system
Disc Collector
Call of the Machine: Collect all six Data Discs, and defeat the Strogg Creator
Destroy the Moon Base
The Reckoning: Infiltrate the Strogg Moon Base, and destroy the fleet
Anti-Gravity
Ground Zero: Find and eliminate the Strogg's great weapon, the Gravity Well
Shut Down the Core
Quake II 64: Enter an alternate timeline, and destroy the Guardians