Serious Sam 4
54 Achievements
15-20h
GOG
La Nonna é Mobile
Meet a powerful granny.
23.6%
How to unlock the La Nonna é Mobile achievement in Serious Sam 4 - Definitive Guide
Upon the completion of the mission "When in Rome" you will get this achievement. 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.