I have a little over 3000 on my hunter and its only been out for a month. It's very possible and it adds a challenge and a reason for casuals to start playing trials again.
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And you have also played almost 3 days total of just trials of osiris, on your hunter alone. I don't even think most non casuals have played that much trials man, thats an insane amount. Only the people who basically spend the majority of their free time playing this game would even be able to come close to getting that emblem if the requirement was 5000 kills for trials. Just an absurd number of kills in a timed, skilled playlist for a stupid emblem.