Warhammer: Vermintide 2

Mission 2: A Grudge Served Cold

After you make it to a large courtyard (Wyr Migdahl) with a gate to the left, wheel at the centre and four towers in front of you to the right, you'll have to make it to the gap between 2nd and 3rd furthest away from you. You'll see some boxes in the middle and other boxes next to the tower on your left with a small snow bank. Jump on the bank, then to the boxes and move until the end of them. You'll see a small black half broken ledge. You need to make this jump, climb through the window and pull a lever to open doors to all towers. If you fall, you'll lose about half your hp and will be able to climb back using stairs to your right.

Once you pull the lever, climb up the ladder and activate small brazier/bonfire. You need to go to each tower, the order doesn't matter. Go inside, climb up and light the bonfire. As soon as all four are lit, you'll complete the challenge and will get the achievement.

Full run captured below:

I tried the "normal" method for several runs and kept falling off. Long story short, if you have trouble with this, use this way easier Battle Wizard method.
Video below.


You can skip first 30 sec of video, because I recorded a bit too much.

You need Battle Wizard, preferably level 30 so that you have Level 30 talent- Burnout (Fire Walk can be activated a second time within 10 seconds).