Halo: Reach Challenges After Xbox Live Shutdown (360): Playable Offline But No Progression Tracking

You can play challenges offline, but progress won't track, and rewards (Credits, Commendations, Achievements) won't unlock.

What Works Offline (No Xbox Live)

• Campaign (Solo / 2-Player Split-Screen / 4-Player System Link).
• Firefight (Solo / 2-Player Split-Screen / 4-Player System Link). Custom Firefight settings.
• Custom Games (Local Split-Screen / System Link) — All maps, modes, Forge.
• Challenges Menu Accessible: You can view and play the challenge maps (Daily/Weekly were cached if you connected before 2021 shutdown).

What Requires Xbox Live (Dead on 360)

• Challenge Tracking / Completion: Server-side validation.
• cR (Credit) Rewards: Armor unlocks, ranks.
• Commendations Progress: Kill counts, medal tallies.
• Achievements: “Complete X Daily Challenges” etc.
• File Share / Theater / Forge World Download.

Modern Alternative: MCC (PC / Xbox One/Series)

• Halo: Reach in MCC has Seasonal Challenges (new system), full cross-play, 4K/120FPS, mouse/keyboard, anti-cheat, active population.
• Original 360 progress does not transfer (separate service records).

For pure gameplay: 360 offline works. For progression/cosmetics: Play MCC.