Except for free legendaries like mark VI. I have Void Dancer. Just got it today.
All of them.
I have mostly everything, just need one more helmet and probably a couple more emblems, but saving up my reqs for next update. 
Everything that can be unlocked by reqs. Only missing the HCS garbage.
Every single thing except achilles helmet.
-Krith’s Left Hand
-Sold a Twin Jewels of Maethrillian earlier because that thing is garbage
-Nornfang
-Mythic armor and helmets from MCC
-Had a Hannibal Scorpion, used it.
-Had a handful of Legendary Warzone and Arena boosts, also used them
Good to know!
Everything. Want a beam rifle? I have over 200.
> 2533274887428223;8:
> Everything. Want a beam rifle? I have over 200.
Wow
almost everything
Everything
I have all of them except the 343 AR weapon skin
I’m at max, if you exclude Achilles, the limited time items, and the emblems that require commendation completions.
the only legendary i have unlocked is Locus. However i do get quite a bit from Warzone Daily wins i have gotten
-3 didact signets
-3 kriths left hand
-2 heartseekers
-1 oni mantis
and the only mythic i got was
-whispered truth
Halo 2 BR, Mark IV Arcadia helmet and Abyss visor.