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 created an item of equipment with the same skill in all four slots. That's at least a Stack 4 bonus skill right there! You can do the Bonus Dance. We won't judge you.