Death Tank

Alright, for this achievement you need to fly across at least half the screen and stick the landing, which basically means land on your treads and not your face, all in 5 seconds or less.

The easiest way to do this is turn off the jump jet helper in the options menu (the options menu on the title screen), and then go to create a game. Go into the options and change the jump jet to have a 25 second duration (in case you mess up) and make sure to checkmark the "start" option, as this means you'll start with it instead of having to buy it.

Next, you'll want to get yourself on the slope of a hill, so you are pointing towards the direction you want to go. With jump jet helper off, the game won't correct your angle. This means when you launch off the hill (using RT + LT) you'll be flying at an angle and will zoom across the screen.

After that, you just need to stick the landing. All this requires is using left and right trigger independently until you are upright. It'll probably take a few tries, but with 25 seconds of jump jet, you should be able to get it before the round ends.

The key is to get on a fairly steep hill, since being in the air too long invalidates this achievement.