At first place, I'm a Spanish-speaker, and I'm not very used to writing in English, so I apologize in advance for possible grammatical errors. Also, I have the Cities In Motion translated into Spanish, and i don't know the exact names for buildings, or things like that. Anyway, I decided to write this guide because I felt that it wasn't very obvious how to get this achievement, probably most people tried and got frustrated when they couldn't get more than 96-98% in coverage. I hope this guide will help in such task.

The achievement is triggered when all travels within a month can be done using your public transport system. It doesn't mean that all people must use your services, it just means that all people *can* use your services to get to their destination.

There is a easy way of getting this achievement, although I consider it's not a 'honest' way. You have to create a city using the city editor, with a few buildings, play that map, and build a line which covers all buildings. It's easy, but I think that it's more fun to do it the 'right' way.

We will be using the Tutorial city, as it's the smallest and simplest of all maps. The mission is getting 100% coverage, so we need to create a lot of lines covering each building of the map. Each building must have green coverage in at least one of all the transport types. These are my recommendations:

• Build a metro line from east to west with 3 stations: one in the school, one in the town hall and one near the train station
  
• You'll probably need a bus/tram line covering areas that didn't get fully covered by the metro line explained above.
  
• Build a tram line from northern factories, until the south end of the avenue, intersecting with the town hall metro station.
  
• Build a metro/train line which connects the city with the airport and the stadium at the south-east of the map. Although a single metro station could cover both stadium and airport, you will need two stations to get them green covered. I recommend using elevated train there, then build a bridge over the river, go underground and connect with the town hall metro station.
  
• You'll need several bus lines in order to connect the remaining areas, including those little houses of the north-east part of the map. Don't forget the south-western farms, i recommend a tram line to get those farms green-covered.
  
• Cover the remaining areas with the lines you consider appropiate.

Once you've done all of that, your transport system should look like the image above.

You have covered all buildings of the city, but you didn't get the achievement, right? You have 96-98% of coverage. You're checking every building in the map, all green-covered. What's happening?

The city has two exits, one on the west and another on the northeast, which are used by the inhabitants for going outside of the city. These exits are treated like a destination itself. A destination that you probably haven't covered, because it's kinda stupid to put a line to nowhere, but that's how it works. Put a tram stop on the road, near the edge of the map, and create a tram line that goes there and turns back to the city. Do that for the two exits, wait a month or two and you'll get the achievement.