Train Simulator:
All achievements starting with "Bristol - Cardiff" (it should be 10 separate achievements) never made it to the game under that name because the developer (I think) changed the name of the add-on. So, all these achievements reappear under the actual title "South Wales Coastal - ..."
The same thing goes for:
- all 10 achievements starting with "London - Gillingham: ..." It became the "Chatham Mainline: ..." achievements
- all 10 achievements starting with "FR [numbers 1-10]: ..." They now are the "Marseille to Avignon: ..." ones.
As all of them never could be earned, it should be safe to just delete them (and they mess up my list

)
Sorry for not having a link to a developer's explanation of it (they are not known for good communication...)