Here is the full list of all 15 Voyager achievements.
Leave your starting city
Visit 5 cities
Visit 10 cities
Visit 20 cities
Visit 30 cities
Visit 40 cities
Travel to North America
Travel to South America
Travel to Europe
Travel to Africa
Travel to Asia
Travel to Oceania
Collect 500 vCash
Collect 1 000 vCash
Become a Vegas gambler