Rec. Totem Axe (or any +20% enchant) and a shield with the following bonuses: +30hp, -5/20%.
Deadly Paradox, Shadow Form(e), Dark Escape, Heart of Shadow, Feigned Neutrality, Dash, Purge Conditions, Resurrect.
I came up with this build about 12 days ago. I haven't seen a *single* other Assassin doing the run and you get asked whether you're 100% alot. Just ignore people giving you a hard time. They aren't worth the air they breathe, let alone a moment of your attention. Time is money.
Method: The first area is easy. Just use Deadly Paradox and Dark Escape until you've reached the first scene, which everyone will skip just like you asked them to.

I'm not going to walk through the whole run in this post, but basically, use Deadly Paradox, Shadow Form and Dark Escape all together when you need to, and as Shadow Form runs out you should cast Heart of Shadow and Feigned Neutrality. Move around to avoid attacks for the few seconds until you can re-use SF and then use 1,2,3 again. (Remember to re-collect the Crystal after each shadow step)
Purge is for if you get caught out by a Sword or unluckily blasted by a pod. Resurrect is to expose scammers who die against your advice, expecting you to be unable to res them.
If anyone finds they can't complete it with this advice, feel free to contact me in the game. I'm usually in Elona Reach these days. Funny thing that.

~Mitsuki Hiyono~