Crimson Alliance

Each character have stats you can max out. These stats represent your X Y B buttons on your controller. You also have a HEART/HEALTH stat which isn't represented by any buttons and you can probably still get the achievement if you max it out.

Everytime you find a weapon or armour (via the shop or chests) your stats go up or down depending on what it you've picked up. To see the stats of an item hit the BACK button on your controller.

So for example if you wanted to max the Slash attack for the Mercenary you keep finding items that help up your X attack (Slash).

You only need to max out ONE stat to get this achievement and not all. You'll know it's maxed because it's out of 20. So 20/20 means maxed or sometimes it can be higher like I got 26/20.

I found I got this achievement a little after midway through the game as your character finds better equipment (armour/wepons). You may be able to get the achievement quicker if you only want one main attack but I wouldn't recommend that.