I don't think flaming helmets will be unlocked by challenges. Because in halo 3 we have the flaming helmet but that's completely already unlocked. The best we can hope for is tomorrow
Now that Reach is coming back, should flaming helmets be made available for everyone to get? : r/halo
Bungie gives out blue flaming helmets in Halo: Reach
How to Get the Flaming Helmet in "Halo Reach" : How to Play "Halo: Reach" - YouTube
If you know what this flame is, here is my nostalgia. - nostalgia post - Imgur
Halo - Yes, you can haz Recon. Tomorrow. | Facebook
Halo Infinite Season 1 Battle Pass Includes Reach-Style Flaming Helmet
Steam Community :: Guide :: Eternal Armor Effect
Bungie Armor | Halo Alpha | Fandom
Amazon.com: Halo Reach Preorder Bonus Recon Helmet Code : Video Games