Hi everyone.
In order to get this chievo, you must set up a 2 player game.
Then you must have a bit of luck since you must keep to tickets.
If you dont have two 10 points or higher tickets, then quit and relaunch the game until you get this requirement.
When you have two 10 points tickets, then go for it.
Now you must take train cards the color you need but your strategy is to complete these 2 tickets plus trying to join them so you ll have the longest route.
Then when you finish your 2 tickets, try to end the game the faster you can preventing you opponent to finish some routes.
DO NOT pick another tickets because if you get only tickets worth 9 points or lower, you will not have the chievo since you must keep a least one of them. That would make an unfinished ticket and miss the chievo.
Hopefully you'll get it.
Good luck, Peace 👍