The story:
I was farming Twin Peaks for achievements and this was the last one I needed but simply couldn't complete it so decided to just skip it and go with BfG achievements, however the next day i queued for Tol Barad battle and joined my daily random bg (which was Twin Peaks) i managed to grab 3 flags and then my Tol Barad que popped, after entering Tol Barad i saw that my achi counter did not reset so i was sitting in TB with 3/9 flags capped. After Tol barad i joined TP again and it was still on 3/9 and i could keep grabbing more flags. So it looks like if you leave Twin Peaks without deserter debuff you can keep your achievement counter running and queue again for more flags.
TLDR:
1. Queue Tol Barad / Wintergrasp
2. Queue Twin Peaks and grab as many flags as you can but don't finish the BG
3. When TB / WG que pops enter
4. If your achi counter did not reset wait til next WG / TB battle and repeat from step 1
Tips / Notes: - If you que Twin Peaks too soon you might finish it before your WG que pops so best time for me to join was arround 10 mins left til battle (1-2min in TP que 8min to grab flags then join WG).
- WG and TB defensive battle is the best cause you have a 100% spot pretty much
- If you finish a Twin peaks game or /afk out your counter will reset and you have to start all over again from 0/9
~Enjoy it while it lasts
~