1. Select the mission Uplift Reserve on Legendary difficulty (ofc)
2. Turn on the Acrophobia skull
3. Fly through the entire mission, you can skip past pretty much everything, just make sure you hit the correct load points otherwise you can brick the mission. Basically just follow along with the mission as normal but now you're speeding through everything.
This is an incredibly easy achievement to get now vs what you had to do prior. Just got it myself.