Final Fantasy XIII: Unlock Sazh Gamer Picture on Xbox 360

To unlock the Sazh gamer picture in Final Fantasy XIII for Xbox 360, you must obtain the Loremaster achievement by using Libra on 100 separate enemies to discern their full attributes.  Please note that simply using Libra once on an enemy doesn’t guarantee that you’ll get their full attributes.  It might be necessary to fight an enemy multiple times and use Libra multiple times on them to attain this achievement.  This shouldn’t be an issue if you use Libra throughout the game, as there are well over 100 types of enemies in the game.