You'll most likely get this achievement/trophy from playing Far Cry 3 naturally. All you have to do is craft 5 different upgrades, including pouches, ammo capacity upgrades, and other equipment. Don't waste your time with syringes as they won't contribute to this achievement.

Embark on an inspiring mission of human connection beyond the UCA. Sam — with companions by his side — sets out on a new journey to save humanity from extinction. Join them as they traverse a world beset by otherworldly enemies, obstacles and a haunting question: should we have connected?