UPDATE: 11th Jan 2016
The 1.12 patch should fix the issues with this achievement not unlocking for some gamers.Patch 1.12 Changelog
Hearts of Stone
Fixes issue whereby achievement titled Wild Rose Dethorned could not be completed.
This solution has a short video of the achievement unlocking at the last bandit camp and video's of potentially missable enemies. The achievement glitched for me on my main game save and I tried on a new HoS and that glitched. I took inspiration from a comment by @Joueur455523401 on @Foxfire49 solution and tried again with success. The video's are from another play through on an secondary account, so I am confident this will work consistently as I have unlocked it twice using this method.
It took an about an 1 hour 5 minutes in total (one uninterrupted play through) to unlock White Rose Dethroned achievement using a new HoS save. At the start screen use an HoS save and choose "Just the story". Allocate point to signs and abilities as you prefer.
Got to the Notice boards at the Seven Cats and Brunwich so the markers are visible on the map. No need to carry out any missions or objectives, just clear the camps. Begin clearing out the first #1 to #8 camps identified by @Foxfire49 in the previous solution. The order doesn't seem to matter, I did it differently on each play through.
At each camp I tried to pull all the enemies close the red highlighted chest, then kill them, Thanks to @Joueur455523401. Scout around the perimeter to make sure you have them all. At one camp with distillation equipment there is an enemy near some bee hives on the perimeter wearing a silver mask make sure you pull him.
Also by the Kuetz castle there is an enemy on his own in a side building area by some cages, you can't pull him close to the chest so just kill him. I kill the enemy around the 5 minute mark in the video below.
Once the you have killed all the enemies at a camp ignore the red chest and looting the bodies, Thanks @Sephiroth oni. I found that looting everything at each camp left me overburdened and I had to drop items. Its possible that dropping items triggers the glitch. Go to another camp. When you reach the final camp and kill the final enemy the achievement will unlock. In the video you can see the camps I visited and markers are still white showing they are unlooted.
I died at one camp and reloaded, I glitched Geralt into FP view, then glitched him into mid air and still the achievement unlocked.
For completeness I have the full 1 hour 6 minute video unedited of the playthrough.
Many thanks to @Foxfire49 @Sephiroth oni @Joueur455523401