Full list of all 56 Tales of Zestiria achievements. It takes around 100-120 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there is 1 DLC pack containing 6 achievements.
This is proof that you've fought many battles while controlling many characters. You can take it slow by changing characters in the Top Menu, but if you want to kick it into high gear, there are battle actions that let you switch in battle on the fly!