Attack on Titan 2

You will get this once you have every achievement in the game. The last achievement that you will most likely have to complete is the one where you have to have 100% your gallery. Final Battle DLC makes it easier. Here is a video of just showing you all the equipment unlocked.

Also here are 2 videos where it's best to farm materials

Also if you want your character to be stronger on Inferno Mode, here's a guide on how to get 200 skill points