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 acquired equipment with a doubled skill from an enemy drop. Very difficult unless you're playing in Hard difficulty or higher! There's a rumor that offering sanctified equipment to a Lord of the Land may increase the chances...