Timer for Signal Fire Sprint in Bergama resets after each fire is lit, prevents completing in under 35 sec to get Signal Fire Zephyr. Presume this timer reset is a bug
No there's not, I got the achievement even with the timers resetting. The achievement is fine. Group up to get it done if you can't do it on your own (I was only able to do it on my stamblade by myself).
The achievement works fine, I've done it several times this year. Use stamina food, have a stamina potion ready, and sprint round the 4 braziers. You do not have to get back to the NPC to complete the achievement the timer for which starts with your first brazier lit and finishes with the last one lit. Don't wait when each brazier is lit to get the message, light it and run.
I was struggling until I noticed one of those green potions you get as a reward returned 6000 stamina and increased speed for the next 8 seconds.
I had a "stamina" meal and then took one before starting and finally managed to complete it.
(also you can team up and work from opposite directions)
You don't even need to sprint or use stam food or potions. Rapid Maneuvers and an optimized path are most important. Do the fires in an inefficient order, and sprinting will not be enough, do it in the right order, and you won't even need to sprint.