Where to find all hidden chests in AC6You’ll find all of AC6’s secret parts in chests fairly well hidden inside the above missions. They usually require you to kill additional enemies, some of which are quite challenging in the later missions, so make sure you have enough health and ...
First, you must have finished Mission 09: Retrieve Combat Logs (Chapter 9). This unlocks the OS Tuning Menu. You must also complete Arena fights to get OS Chips (also unlocked after Mission 09). Now go to Garage > OS Tuning > Core Expansions. Buy the first level of each Core Expansion...