Serious Sam 4
54 Achievements
15-20h
GOG
All Roads Lead To Rome
Head into Rome. Ditch Rodriguez.
26.9%
How to unlock the All Roads Lead To Rome achievement in Serious Sam 4 - Definitive Guide
You obtain this achievement for completing the mission "The Die is cast" you are basically running most of the time and then end up having to defend an area for a long time until the door opens and the mission finishes. To make this easier make sure you have infinite ammo turned on and even tourism difficulty or play on co-op and set respawn timer to 0.