This Side Up Achievement in Halo: The Master Chief Collection

Once you destroy the four reactors inside the engineering bay and take the elevator up to vehicle station, grab the first Warthog on your right. From here, you’ll need to escape the Autumn without ever flipping over your Warthog or being forcibly ejected from your seat. This achievement is actually very easy so long as you are a competent vehicle driver. Also, it's worth mentioning that if you do flip your vehicle at any point and are forcibly ejected from the seat, you can always restart your checkpoint as it will not void the achievement.

Each of the four hangers you drive through will have a different layout, meaning you’ll need to adapt quickly as you drive past the explosions and firefights between Covenant and Flood. For the first hanger, driving straight down the middle is the safest route. Once you reach the second and third hanger bays, stick to the ramps on either side since the middle path will be blocked. In the final hanger, you’ll have to slalom around the pillars on the middle path, which can prove to be a little tedious and dangerous.

After this fourth hanger, the ride should be a little smoother until Cortana warns you of a large jump ahead. The best strategy in tackling this jump is to line up the Warthog evenly with the ramp and floor it, then ease up on the acceleration when you’re mid-flight. This will prevent your vehicle from tipping forward, thus ensuring you’re not ejected from your seat when you land. After the jump, you’ll eventually need to exit the Warthog and sprint down the runway and past some Flood in order to reach the Longsword. If you managed to stay planted inside the Warthog during the entire ride, the achievement will unlock once you get inside the Longsword.