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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If you’re absolutely stuck with just core engineer and rifle, try equipping Elixir Gun and just 111-ing it down with Tranquilizer Dart. It’s not the strongest thing around, but it’s one of the few autoattacks engie has that doesn’t pierce, bounce, or explode. Make sure you don’t have any traits like Aim-Assisted Rocket that trigger yet more AoEs.
I also have some hero points invested in Holo, but didn’t really dip into it yet. However with most skills I’m using he regenerates HP too fast and the oozes do too much damage. I think I need to postpone this achievement until later when I have better equip or another character which is more suited for that task (I read that Necro is quite good)
Yeah, I think back when I did those acheevos it ended up being a mix of necro, mesmer, and maybe guardian, even though I’d rather play engie. Can count on it coming back next year if you don’t clear it all this time around, though.