Mercedes Benz #24 TANKPOOL24 Racing TruckTune:
"Danger Sign" by "Maka91"Danger Sign:
Ambleside Edge (Left of the Hub)
If the danger sign is not available to you, make progress on the danger signs you have to unlock more.
Approach the danger sign from the south, using the dirt road, and a straight approach to hit the ramp at your highest speed. You should easily go over the required distance upon landing and the achievement will unlock.