Need for Speed: Shift 2: Unleashed

As far as 2019 of July me and two others (Sarcasticjoker), and (darkiling1542) figured out the solution to getting this and I think the rest of the dlc achievements.

Step 1: attempt what you are going for, if nothing pops then this solution is for you!
Step 2: after your attempt what you are going to want to do is leave the lobby, and on the menu where you select career, Xbox live, quick, car lot, etc you are going to press the Xbox home button and press X to sign out.
Step 3: once you sign out a prompt should pop up saying a change of gamer tag was changed and you will be sent back to the start main menu. Something along those lines! Just hit The A button for ok.
Step 4: when you are back on the start menu press the start button, then you select your profile.
Step 5: now you are going to go and to quick (quick race), and just pick the oval track, one opponent, one lap, use one of the speed hunters cars, doesn’t matter if you win or lose just complete it.
Step 6: now just attempt the achievement you are going for and it should unlock.

NOTE: this should work for the legends achievement too!
Also, you may have to use this method every time you start the game for the first time!

very simple

1. you can just find someone online and beat them in a speed hunter car.

2.make a boosting sesson just for it as you only need 2 so its not hard to find someone.

Easy solution

1. Get a boosting partner who also have the DLC.

2. Once in game press the 'X' to bring up the Xbox menu, then press sign out (Blue x Button)

3. Sign back in, and look for a quick race then select one of the Speedhunter cars (I did mine in a Fairlady Z around Silverstone Short circuit)

4. Complete the race and it should pop right when it shows the results screen

The online for this game is basically dead for normal players let alone people with the DLC so your only option here is to create a gaming session.

The fastest races to win are drag races with the Nissan Skyline GT-R (R32) Speedhunters (Or any other speedhunter car).

The achievement will pop after finishing the 3rd heat.