Just today I decided for some reason to finally try and get the dark age arsenal triumph so put on some weapons earned from gambit (night watch, bottom dollar and bad omens) and won a match with them equipped but the triumph didnt unlock.
I've been wondering are not all weapons dropped from gambit match completions/rank ups classed as gambit weapons?
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Distant Relation, Trust, Pillager, Bygones, Hazard Of The Cast. Don't think Nightwatch counts but not 100% Good luck.