Halo Wars Timeline Events

The Halo Wars Timeline Events is a subsection included in the main menu of the Halo Wars game that shows the timeline of the Halo Universe as it pertains to Halo Wars. The events are acquired by retrieving Black Boxes within the campaign elements of the game, as well as winning skirmish matches using different leaders, both UNSC and Covenant.

Related achievements

 * Halo Academic is an achievement that is unlocked when you unlock 20 timeline events.
 * Halo Historian is an achievement that is unlocked when you unlock all timeline events.

Unlocking
You must collect all the Black Boxes in campaign, win on every multiplayer map with every Leader and win both gametypes (deathmatch and standard) to unlock all the timeline events.