TRIALS of MANA

This achievement is tied to the defeating Anise in the post-game dungeon. Once you beat the main story, the game will continue on and have the normal quest markers to point you in the right direction to unlocking and completing this dungeon. There is an achievement for beating Anise on Hard difficulty, but you'll want to save that for your NG+ playthrough, so your first time through the game just beat her on whatever difficulty you'd like to unlock NG+ and then carry over your data to Playthrough 2.