Silver Arrow Achievement doesen't unlock

[Keulenmuck]

Hi.
I tried the achiement several times on Hockenheim-Circuit with Mercedes,2 times I drove 3 Laps,1 time I tried it with 20% Racetime.
Won everytime,but the achievement didn't unlock.
I did the races from the GrandPrix-menu.
What's going wrong here,I found another guy here,having the same problem.
The Tifosi-Achievement (doeing the same with a Ferrari at Monza) unlocked at the first time.....:confused:

[RYARNI]

Hi.
I tried the achiement several times on Hockenheim-Circuit with Mercedes,2 times I drove 3 Laps,1 time I tried it with 20% Racetime.
Won everytime,but the achievement didn't unlock.
I did the races from the GrandPrix-menu.
What's going wrong here,I found another guy here,having the same problem.
The Tifosi-Achievement (doeing the same with a Ferrari at Monza) unlocked at the first time.....:confused:

Got this yesterday on a 1 lapper with Schumacher and everything set to Easy.

[Chesty]

Make sure you take the right Mercedes (Schumacher or Rossberg, not Hamilton/Button). Then it should unlock even after a 1 round race.

[Keulenmuck]

Make sure you take the right Mercedes (Schumacher or Rossberg, not Hamilton/Button). Then it should unlock even after a 1 round race.
And that was exactly the problem,I didn't notice,that you can pick up several Mercedes,got the achievement with Schumacher.
Thx a lot;)