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 returned alive from challenging all eight Malevolent Crucibles. Since each one only allows certain characters to enter, you'll need mastery of techniques and knowledge for each one of them.