To unlock this achievement, you need to complete eight deliveries in total originating from the following locations, one for each company. The destinations or order of completion does not matter.
1. Avalanche Steel (West)
2. Avalanche Steel (East)
3. Coastline Mining (North)
4. Coastline Mining (South)
5. Plaster & Sons
6. Sell Goods
7. Wallbert
8. Voltison Motors
I recommend visiting each location manually and activating the cargo screen from there, instead of using the Freight Market screen from the menu, as the two locations for both Avalanche Steel and Coastline Mining could result in accidentally picking up unnecessary jobs from a location you've already crossed off the list. Be wary of Ogden to the north and Provo to the south, as the borders between towns aren't visible and a few cargo companies from them are very close to Salt Lake City.