Joe Dever's Lone Wolf Console Edition

You can work towards this at any merchant you find. The merchants have 4 options, these are Buy, Sell, Upgrade and Inventory. Go into Upgrade and select your Kai Armour. It will tell you at the bottom the required materials and the cost. To fully upgrade my armour, I had to do it three times.

I got this during Act 2. I had upgraded my armour early in Act 1 when I had the resources. Then when I reach Act 2 I found merchants selling the final required items. I have found some of them during fights, and then bought the remaining items I needed. Just be aware it can be expensive to do it this way. My final upgrade cost me close to 700 with cost of materials and upgrade cost.

upon purchasing the final upgrade, this trophy will unlock.