Unlockable: Character Classes
Below is a list of unlockable character classes, which are listed on the left. To the right of each is the name of the mission you must complete in order for that particular class to become unlocked.

Arcanist - The Nu Mou Nobles
Assassin - Veis Assassin
Beastmaster - Knowing the Beast
Cannoneer - The Bangaa Brotherhood
Chocobo Knight - Popocho's Chocobos
Dragoon - Kyrra Dragoon
Fighter - To Be A Fighter
Flintlock - Of Kupos and Cannons
Fusiler - Goug Consortium
Geomancer - Geomancer's Way
Green Mage - Green Dominion
Heritor - Gifted
Lanista - A Lanista's Pride
Master Monk - Complete Banbanga!
Parivir - The Eastwatch
Raptor - Instrument of Inspiration
Ravager - Ravager
Scholar - Treasured Tomes
Seer - Cat's Meow
Spellblade - To Be a Spellblade
Trickster - Sleight of Hand
Viking - Lord Grayrl!

Unlockable: Espers
To unlock the Espers listed on the left, complete the corresponding mission listed on the right.

Adrammelech - The Moorabella Cup
Belias - The Camoa Cup
Chaos - The Loar Cup
Cúchulainn - The Odalia Cup
Exodus - The Jylland Cup
Famfrit - The Goug Cup
Hashmal - The Fluorgis Cup
Mateus - The Graszton Cup
Shemhazai - Of a Feather
Ultima - Hunted
Zalera - The Last Step
Zeromus - The Five Kings
Zodiark - A Lasting Peace

Unlockable: Libra
There’s a special skill known as Libra, which has a different use in this game than most other Final Fantasy titles it appears in (it reveals traps on the field of battle as opposed to the statistics of a targeted enemy). To acquire it, start up FFTA2 with a copy of the original Final Fantasy Tactics Advance in the GBA port on your DS.

Hint: Luso's Journal Answers
During the sequence with Luso’s summer journal, you can answer three questions in the following order to unlock different clan abilities from the get-go. The first answer is represented by A, the second by B, and the third by C.

AP Up +1 - B, C, C
Clan Up +1 - B, B, C
Evade Up +1 - B, A, A
EXP Up +1 - B, C, B
Gil Up +1 - B, A, C
Luck Up +1 - B, A, B
Power Up +1 - B, B, B
Smash Up +1 - B, B, A
Speed Up +1 - B, C, A

Hint: Recruit Frimelda
To recruit the character Frimelda, complete the following chain of missions: Under the Weather, A Chill in the Night, Show of Strength, Hunted, and Memories Forged.

Hint: Experience Boost
Before each battle, you’ll get to choose with advantage you want to give your crew (so long as you don’t break the judge’s rules for that battle). You should always, always choose an experience boost over any other statistical advantage. You’ll rarely (if ever) run into a battle where you should be challenged to the point that you’ll need a mild speed or strength boost, for instance, but experience is always a hot commodity that should be gathered when and where you can. Giving yourself an experience boost during each battle will let your characters level up quicker, and ultimately this will lead to an even stronger party that will never need statistical advantages in battle. Continue to repeat this process and you’ll be working with a really strong crew before long.

Easter Egg: Final Fantasy XII Cameos
If, late in the game, you accept the mission to catch the Aerodome Prankster, you’ll see Vaan from Final Fantasy XII fighting in that battle as well. If you’re victorious, Penelo (also from Final Fantasy XII) will come out and talk to you.