Unlockables

Clan Abilities - During the prologue (Luso's summer journal), you can answer the three questions in the following orders to unlock different clan abilities from the beginning.

AP Up 1 Answer B, C, C
Clan Up 1 Answer B, B, C
Evade Up 1 Answer B, A, A
EXP Up 1 Answer B, C, B
Gil Up 1 Answer B, A, C
Lucky 1 Answer B, A, B
Power Up 1 Answer B, B, B
Smash Up 1 Answer B, B, A
Speed Up 1 Answer B, C, A

Unlockable Classes

Arcanist Complete The Nu Mou Nobles quest
Assassin class Complete quest,Veis Assassin

Beastmaster Complete the quest Knowing the Beast

Cannoneer Complete Quest: The Bangaa Brotherhood
Chocobo Knight Complete the Popocho's Chocobos quest

Dragoon Complete Kyrra, Dragoon

Fighter Complete "To be a Fighter"
Flintlock Complete "Of Kupos and Cannons"
Fusiler Complete the Goug Consortium quest

Geomancer Complete "Geomancer's Way" quest chain
Green Mage Complete Green Dominion Quest

Heritor Complete "Gifted" Quest
Heritor Talk to Lezaford and go to Zeldei Woods before fighting Illua 3rd

Lanista Complete "A Lanista's Pride"

Master Monk Complete Banbanga!

Parivir Complete "The Eastwatch" quest

Raptor Complete "Instrument of Inspiration"
Ravager Do the quest "Ravager"

Scholar Complete the Treasured Tomes quest
Seer Complete the Cat's Meow quest
Spellblade Complete "To Be a Spellblade" quest

Trickster Complete the Sleight of Hand quest

Viking Complete the Lord Grayrl! quest

Unlocking clan ability Libra early - You can aquire the clan ability 'Libra' at the start of the game by having a copy of Final Fantasy Tactics Advance in the Slot-2 (GBA) of your DS.

Libra Insert a copy of Final Fantasy Tactics Advance when starting a new game or loading a game.

Unlocking the FFXII Espers - By doing certain quests of the game, you can unlock items that allow you to summon the Espers of FFXII, so long as you have a full Smash Gauge.

Adrammelech Complete "The Moorabella Cup"

Belias Complete "The Camoa Cup"

Chaos Complete "The Loar Cup"
Cúchulainn Complete, "The Odalia Cup"

Exodus Complete, "The Jylland Cup"

Famfrit Complete, "The Goug Cup"

Hashmal Complete "The Fluorgis Cup"

Mateus Complete "The Graszton Cup"

Shemhazai Complete the event "Of a Feather"

Ultima Complete "Hunted"

Zalera Complete "The Last Step"
Zeromus Complete "The Five Kings"
Zodiark Complete, "A Lasting Peace"