In Mission 2, get significant air in the Warthog at midnight This mean your console must be at 12:00 AM? The game have a day / night cycle I'm unaware of? You get on the warthogs at the beginning of the mission and it's very bright...
I have tried just sitting by the warthogs to see if there is a day and night cycle but that's not the case... looks like I need to see my clock on my system back to 11:55 and wait til 12 and start jumping lol
I got it!!!! You need to set your console back to 11:55 pm and rush to the warthogs on mission 3. When the clock strikes 12:00 AM do some jumps!!! and then the achievement should pop!