Final Fantasy XII

Ashe	Awarded for having the average party level over 50.
Ba'Gamnan	Awarded for completing the hunt catalog.
Balthier	Awarded for attacking 300 times.
Basch	Awarded for killing 500 foes.
Belias	Awarded for obtaining every esper.
Carrot	Awarded for defeating the monster, Carrot.
Chocobo	Awarded for walking 50,000 steps.
Crystal	Awarded for obtaining every character's magics.
Dalan	Awarded for completing every map.
DeathGaze	Awarded for defeating the monster, Death Gaze.
Fafnir	Awarded for defeating the monster, Fafnir.
Fran	Awarded for using magic 200 times.
Gabranth	Awarded for initiating every fusion technique.
Gilgamesh	Awarded for defeating the monster, Gilgamesh.
Gurdy	Awarded for using/spending 1,000,000 gil.
Hell Wyrm	Awarded for defeating the monster, Devil Dragon.
King Behemoth	Awarded for defeating the monster, King Behemoth.
Migelo	Awarded for selling 1000 loot.
Mimic?	Unlock and buy all Monographs and Canopic Jar, also create and buy several Bazaar items to unlock.
Montblanc	Awarded for attaining (monster) chain level 50.
Penelo	Awarded for getting 100,000 gil.
Rasler	Awarded for mastering all character's license board.
Reks	Awarded for earning 500,000 clan points.
Trickster	Awarded for defeating the monster, Trickster.
Ultima	Awarded for defeating the esper, Ultima.
Vaan	Awarded for stealing 50 times from enemies.
Vayne	Awarded for using techniques 100 times.
Vossler	Awarded for obtaining every character's techniques.
Yazmat	Awarded for defeating the monster, Yazmat.
Zodiac	Awarded for defeating the esper, Zodiac.

Unlockable Fishing Spots

Once the Fishing mini-game began, you can only fish in the Lower Reaches fishing spot. However, you can unlock more fishing spots when get to certain requirements.

Unlockable	How to Unlock
Master Den	Fish up Cactoid Crest un the Secret Reaches
Middle Reaches	Get 5 perfect fishing in the Lower Reaches
Secret Reaches	Fish up Cactoid Bond in the Upper Reaches with Matamune
Taikou Chest (treasure)	Get 9 perfect fishing in the Master Den
Upper Reaches	Get 5 perfect fishing in the Middle Reaches

Secrets

Zodiac Spear

The most powerful weapon in the game has a trick to it that those who have to open EVERY treasure chest would miss out on. There are 4 places with treasure chests that must NOT be opened in order for the Zodiac Spear to appear:

1) Treasure chest in Lowtown, outside of Old Dalan's place
2) When sneaking into the palace (Before getting the Goddess Tear), there are several chests in the Cellar. Do not open the two chests in the southeast corner.
3) All treasure chests in the Confiscatory (the place where you get your weapons and armor back after being captured)
4) In the Phon Coast, later in the game, there is an island with 16 chests all near each other. The 4th chest that must NOT be opened is among these, so it is best to leave them all alone. They only contain Gil anyway.

If you've left all these treasures be, you'll find the Zodiac Spear in the Necrohol of Nabudis. It sports a whopping +150 attack and, like all spears, +8 Evasion.