FFX: Feel the Pain Achievement

Anima is a summon that can be obtained through a series of steps. The first and longest step is to collect the six items hidden in the game's temples (Besaid, Kilika, Djose, Macalania, Bevelle, and Zanarkand). The final one in Zandarkand can't be retrieved the first time you go through, so you'll have to return after getting the airship for that one. See here for how to get the items from each of the temples.

Once you have all six items, use the search function on the airship to try and find a hidden temple in the SW section of the map. Search X=14, Y=57 to find Baaj Temple. Head there and proceed through the water to the entrance, then interact with all the statues inside (each one requires one of the items we got from the other temples) and after all have been used you can enter the Chamber of the Fayth to obtain Anima and unlock the achievement. See here for more info on Baaj Temple.