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 battled a wide swath of enemies. By the way, the more of the same enemy you defeat, the more likely that enemy becomes to drop equipment with skills attached. Time for some population control!