Select 'Historical Campaigns' then at the 'Planet Selection' screen for 'Clone Wars or 'Galactic Civil War' press Square, Circle, Square, Circle and ALL the planets for that particular era will become unlocked.

A sneaky tactic in this game is to stand, crouch or lay near any of the replenishment depots with a sniper rifle and then fire at the enemy from there without having to worry about health or ammunition.

When you win the indicated mission the corresponding feature in the gallery will become unlocked.

Unlock Kamino Storyboards:
Beat Kamino - Assault On Kamino mission.
(Historical Campaigns: Clone Wars)

Unlock Naboo Stills:
Beat Naboo - Rebellion On Theed mission.
(Historical Campaigns: Clone Wars)

Unlock Hoth Concept Art:
Beat Hoth - Battle of Hoth mission.
(Historical Campaigns: Galactic Civil War)

Unlock Geonosis Stills:
Beat Geonosis - Battle Of Geonosis mission.
(Historical Campaigns: Clone Wars)

Unlock Weapons and Units Stills:
Beat Rhen Var - Mountaintop Defenses mission.
(Historical Campaigns: Clone Wars)

Unlock Star Wars Battlefront Art:
Beat Kashyyyk - Aggressive Negotiations mission.
(Historical Campaigns: Clone Wars)

Unlock Tatooine Concept Art:
Beat Tatooine - Siege Of Mos Eisley.
(Historical Campaigns: Galactic Civil War)

Unlock Yavin Concept Art:
Beat Yavin 4 - The Fall of Yavin 4 mission.
(Historical Campaigns: Galactic Civil War)

Unlock Endor Stills:
Beat Bespin - Battle in the Clouds mission.
(Historical Campaigns: Galactic Civil War)

Unlock Bespin Concept Art:
Beat Bespin - The Liberation of Cloud City mission.
(Historical Campaigns: Galactic Civil War)

Select all Planets:
In single player on the Historical Campaign mode select the Era you want to play Clone Wars or Galactic Civil War which will bring you to the Planet Selection screen. Then press Square, Circle, Square, Circle to be able to scroll left or right through the various planets.

Unlock all Historical Campaigns and Maps:
In single player on the Historical Campaign mode select the Era you want to play, Clone Wars or Galactic Civil War which will bring you to the Planet Selection screen. Then press Square, Triangle, Square, Triangle to unlock all Historical Campaigns and maps.

Unlock Artwork, Stills and Storyboards

Bespin Concept Art -
In Historical Campaigns: Galactic Civil War beat the
Bespin: The Liberation of Cloud City mission

Tatooine Concept Art -
In Historical Campaigns: Galactic Civil War beat the
Tatooine: Siege of Mos Eisley mission

Yavin Concept Art -
In Historical Campaigns: Galactic Civil War beat the
Yavin: The Fall of Yavin 4 mission

Hoth Concept Art -
In Historical Campaigns: Galactic Civil War beat the
Hoth: Battle of Hoth mission

Endor Stills -
In Historical Campaigns: Galactic Civil War beat the
Bespin: Battle in the Clouds mission

Geonosis Stills -
In Historical Campaigns: The Clone Wars beat the
Geonosis: Battle of Geonosis mission

Weapons and Units Stills -
Historical Campaigns: Clone Wars beat the
Rhen Var: Mountaintop Defenses mission

Naboo Stills -
In Historical Campaigns: Clone Wars beat the
Naboo: Rebellion on Theed mission

Kamino Storyboards -
In Historical Campaigns: Clone Wars beat the
Kamino: Assault on Kamino mission

Star Wars Battlefront Art -
Historical Campaigns: Clone Wars beat the
Kashyyyk: Aggressive Negotiations mission