Test Drive Unlimited 2
57 Achievements
1,195
150-200h
Fast and Luxurious
Drive at 400 km/h (249 mph) for 5 sec. (any game mode)
10
How to unlock the Fast and Luxurious achievement in Test Drive Unlimited 2 - Definitive Guide
That mission is a 13,5 km drive in a more or less straight line (you have to go through two roundabouts close to the end, and the road goes slightly to the right around the middle)
Personally I got the achievement when it was between 5,5 and 1,5 km to go. That is a completely straight line until you collide with the first roundabout.
So earn enough money to to actually buy a fast enough car will take hours. With this solution you could possibly do it right away in Ibiza. (Only 1 of the 8 DLC missions will be shown at a time,; to change it to this one either wait maximum 24 minutes or win/fail one of the others)
(I didn't look at the speedometer at the time, so I hope this wasn't a bug :) On that note, there is another bug that may occur that simply removes all AI traffic from the roads, which makes this achievement really easy, either in this mission or with your own car. But I think that bug is quite rare.)
For this achievement, you can be driving any car and be in any game mode - Whether it's in free roam or a race, this will unlock.
It is confirmed that you can go to a car showroom and test drive a car and get the achievement. I'd highly recommend using the Bugatti Veyron.
Simply go to the European Car Dealership "European Cars (south)" just north of the Airport and test drive the Bugatti Veyron. When you are outside of the dealership, make sure you're going to the right - Now just floor it and dodge the traffic until you hit the speed.
Alternatively, you can purchase the Bugatti Veyron and go to Hawaii. Once you head out of the Airport - Head toward the right (East) and floor it. This is possibly the longest and straightest piece of road in the whole game, so this road is by far your best bet.