Hard things worth attempting together

Complete the full mission set at S rank with disciplined non-lethal clears, evidence collection, and no officer losses.

Mission changes and major updates can alter the exact route and completion estimate.

Finish a campaign on Legendary with the playlist's full skull set active.

Supported co-op player counts differ between Halo campaigns.

Complete all three consecutive Elite Deep Dive stages with one team and no mid-run loadout changes.

Survive an entire campaign with Realism rules and Expert damage.

Work through a Rundown and complete its deepest available expedition as a coordinated squad.

Rundown structure and expedition availability change with game updates.

Finish every mission in a difficulty-10 operation without abandoning the campaign.

Clear a full raid with no fireteam deaths from launch to final encounter.

Raid availability, power requirements, and triumph conditions vary by season.

Prepare a coordinated hunting party and clear the Fatalis special assignment within its time limit.

Estimate includes gearing and repeated attempts, not the full preceding campaign requirement.

Clear a full heist at the highest standard difficulty with the One Down modifier enabled.

Run the cooperative campaign together and aim for a clean, reset-free solution to every chamber.

This is an editorial challenge built from the official two-player cooperative campaign.