Steam Main: Schmetterling Uncompletable

On paper I've found all the route task on Maintalbahn, yet I didn't receive the MAIN: Schmetterling achievement. This hurts my completionist heart Is there any way to fix this? Or is there maybe a hidden task which I didn't find? All four types says 25/25.

Edit: Steam global achievements chart says that a whopping 0,1% of the playerbase already received this achievement, so it may not be impossible

 

Same problem here.

 

on steam i had to do those again on a new profile
then it unlocked

 

You must be that 0,1% then Thanks for the tip, will try it (when I have the patience )

 

I tried with a new profile. Still not unlocking.

 

I also found everything but the achievement wont unlock. Tried it on another profile same thing, still locked.