To unlock this, you first need to find all three of the landers. The easiest way to do this is to just make your priority opening all the doors you need to open in the early rounds so that the zombies do not cause you to many problems.
One lander is accessible with only one door purchase. From the room in which you begin, buy the door on the second level. Go right outside of the door and the lander station is up on a big platform in the corner of the map.
To reach a second lander station, go back towards the first door you opened and go take the other path (left as you exit the door). You will then need to buy one more door at the end of that path, but the lander station is in the next area at the end of the path.
For the last station, go back to the area with first station. Buy the gate that leads to the power, then buy the gate that leads to the Pack-a-Punch. Directly inside and to the right of this gate is a staircase. Go up that staircase, buy the door at the top, and the last lander is down at the end of that area.
Once you have the paths open to the landers, just run to the power, turn it on, and then go to one of the three stations. You first have to call the lander and wait for it to arrive. Then you buy it for 250 points and ride it back to the beginning room. Do the same thing at the other two stations, and you will get the achievement.