
In this guide I will be showing you how to get the “He’s Running a Marathon…” achievement on Halo 2 Classic.
He’s Running a Marathon… Achievement Guide
Walkthrough
You can get this achievement in the opening cinematic of the mission Gravemind in Halo 2: Classic on Legendary.
To do this, you must watch the entire opening cinematic in classic mode and Legendary, it will not unlock in anniversary mode.

You must watch the first few minutes with the Gravemind as you can’t skip the cutscene.

Then in the next scene it brings you inside High Charity, where you will unlock the achievement.
Fun fact: The guy in the boxers is actually Jason Jones, one of the founders and developers of Bungie!
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