Warhammer: Vermintide 2

The first step which is not part of the guide is to get to the end of the map on ACT II Athel Yenlui on LEGEND Difficulty. How you do that is entirely up to you:

Play legit

(fudge) Play through on your best character, after reaching the end everyone except the host can leave and rejoin as one of the needed characters.

(cheese) Have the Ranger Dwarf use smoke bomb glitch (will be patched soon) to end of map and then invite group in.

Required characters: Shade Kerillian, Ranger Veteran Bardin, Huntsman Markus Kruber

Once you reach the Leylines, kill the few remaining vermin and then nothing will spawn until one of the wheels is activated. So NO practicing. With that being said it is helpful to make sure each person understands completely on what they are looking at and supposed to do.
So, looking into the the pit there is a big wheel in the middle and 3 ramps with posts to activate to spin wheels and ALL WHEELS WILL SPIN COUNTER CLOCKWISE and THE WHEELS WILL NOT AUTOMATICALLY STOP AT THE CHECKPOINT, so if you pass the check mark, you will have to do another full spin which will result in failing the achievement.

The post on the left will spin the outermost ring.
The post in the middle will spin the middle ring.
The post on the right will spin the innermost ring.

With the 3 stealth characters (Shade, Ranger Dwarf, Huntsman) standing on each post and looking at the circle, you should view it like a clock: Straight out from your view is 12 0'clock and at your feet is 6 o'clock.

The Left post, outer ring should note that the outer completion tick marks are at 11 & 2 o'clock & the outer wheel tick marks are at the 1 & 10 o'clock positions. This person should focus on the 10 o'clock mark and will spin it almost a complete turn and stop on the outer tick mark in the 11 o'clock position.

The middle post controlling the middle ring should note, from their view, the completion tick marks are at the 11 & 7 o'clock position & the middle ring marks are at the 11 & 6 o'clock positions. This person should focus on the 6 and spin it almost a complete turn to the 7 o'clock position.

The right post controlling the innermost ring should note from their view the completion tick marks are at the 7 & 3 o'clock position & the ring marks are at 1 & 4 o'clock position. This person should focus on the 1 and spin it around to the 3 o'clock position.

Now that everyone knows their objective, its time to get to business. Start a countdown so all 3 rings are started at the same time by holding down the X Button. Once one of the persons sees vermin getting near the person on the opposing post, all players should activate their stealth special by tapping LB. Note: it is not uncommon to take a hit or two while in stealth. So, keep focused on the objective and press & hold X again if your ring spin stops prematurely from the the sucker punch. After all 3 rings line up to the outermost tick marks glowing in blue, less than 30 secs, the achievement will pop immediately.

Map completion is not required for the achievement but is required to complete your book challenges and chest collection.