The complete guide to “kill cascade”

Overview

This guide will show you three things:How to get the “long way down” achievementHow to beat the challenge with 3 starsHow to find the hidden emily doll

“Long way down” achievement

So this is fairly simple, play normally until you are about to reach the tallboy, then blink up to that tilted building, and up onto the demlished one (the one in the background of the following image)
after that climb over the wall and stand on whats left of the wooden floor, and jump over the wall you are facing down to the final target (Jessamine Kaldwin) let your blink regen as you may need to blink twice for you to reach it

Beating the challenge with 3 stars

This can be tidious to do if youre not fast enough or arent used to drop assasination as it must be done perfectly or else you will not have enough points
As soon as you start jump over the first two guards (the ones with green lights) and agility/blink jump to the 3rd one (yellow light), after that blink up to the pathway infront of you instead of heading down
Look up to see a floating upside-down boat, agility/blink jump ontop of it
walk up to its rear-end and look for a red light, agility jump and blink towards it, then try to strafe in order to hit the guard belowLastly you must now get up on the destroyed building like you normally would for the “long way down” achievement

Emily’s doll

this is very well hidden, go the normal path (the one that the game leads you through) up until the last jump, simply jump onto the tilted rails look up and to your left you will see this.. weird metal container
Blink up to it and inside you will find Emily’s doll