Welcome to the Weekly Question Post on c/guildwars2!
This post is dedicated to those questions that you might not think is worth making a whole post about, but sure is worth getting an answer to ;)
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Took me roughly 10 seconds on my Soulbeast with Longbow. I know, this does not help your cause, but I like that GW2 professions have still (after many balance patches) unique strengths and weaknesses and that GW2 is still (even after EoD jade bots) very alt-friendly.
I think that a Pistol-Pistol Payback Deadeye works equally good for this achievement, but I haven’t tried it yet.