You can get it in the way mentioned above, but it is possible to get with going online or making a separate account. All you will need is another controller, and it will take around 30 minutes.
At the main game menu press the join button on the second controller. Select "add guest" and a new car will pop up next to yours. Go into "expedition mode." Press "mutator settings" and change the goals to 1 goal, so the match will end when 1 goal is scored.
Exit the mutator settings and click "create match." Now you will need to score a goal with either controller. (preferably yours, because you will level up faster if you score the goals) Once the match ends collect the items and press "play next match." You will need to repeat this until the guest account has every car in the game that it can win. You can see this in the garage, you will have all cars except 2, will be 2 empty slots.
When the guest account has won every car that it can win, you will need to win 1 match with everyone of those cars. The easiest way is to select the first car, go to "expedition mode", score a goal with the guest controller, winning the match. You will then need to go back to the garage, select the second car, and win a match with that car.
Once you win a round with the last car, you will get the HogSticker. With the main controller choose the Armadillo in the garage, (this is achieved by winning a season) and win a match with it. The achievement will then pop up.
Note: Do not exit the game or remove the guest, as you will loose all of the progress from it.