Rogue Galaxy

Completion bonus:
Successfully complete the game and save the game when prompted. Load the cleared game data. The Ghost Ship can now be reached on the Galaxy map. Additionally, hold R1 while starting a new game at the main menu to have all previously unlocked costumes available.

Ghost Ship Extreme level:
Answer all the Seventh Mystery questions in the Ghost Ship to get the Key Of The Underworld. Use the Key of the Underworld to access the Ghost Ship Extreme level.
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Alternate costumes:
Complete the indicated task to unlock the corresponding alternate costume.

Captain's Clothes: Successfully complete the Ghost Ship.
Deego's Destructo Attachement: Chest on Mariglenn.
Deego's Full Metal Jacket: Complete MIO's Revelation Flow.
Deego's Heavy Attachement: Chest on Vedan.
Deego's Longardian Armor: Buy from Alice's Weapon Shop on Zerard.
Jaster's Captain's Uniform: Finish Ghost Ship.
Jaster's Desert Claw's Outfit: Complete MIO's Hunter Ranking.
Jaster's Jungle Coat: Chest on Juraika.
Jaster's Pirate's Outifit: Finish Alistia Sidequest.
Jupis's Hi-Tech Mobile Wear: Complete MIO's Insectron.
Jupis's Lab Coat: Chest on Zerard.
Jupis's Leather Wear: Starting Outfit.
Jupis's Riding Outfit: Defeat Quarry in "The Shapeless Assassin".
Jupis's Vintage Wear: Buy from Hanbarney's Item Shop on Zerard.
Kisala's Arina's Sleeve: Complete MIO's Hunting Record.
Kisala's Her Majesty's Attire: Chest on Mariglenn.
Kisala's Swimsuit: Complete Ghost Ship: Extreme.
Kisala's Phantom Robe: Chest on Vedan.
Kisala's Tribal Two-Piece: Defeat Quarry in "The Rumored Ladyhunter".
Lilika's Royal Servant's Clothes: Chest on Juraika.
Lilika's Star Traveler's Outfit: Chest on Rosa.
Lilika's Stealth Clothes: Win the Insectron S-Rank Tournament a second time.
Lilika's Sun's Beloved Wear: Complete MIO's Quarries.
Simon's Cosmo Jacket: Defeat Quarry in "The Voracious Wanderer".
Simon's Hand-Knit Sweater: Buy from Corbis' Item Shop on Vedan.
Simon's Sho's Clothes: Complete Ghost Ship: Extreme twice.
Simon's Traditional Worksuit: Chest on Zerard.
Simon's Zero-G Suit: Complete MIO's Rare Items.
Steve's Energy Armor: Buy from Joshua's Shop on Zerard.
Steve's Izerium Armor: Complete MIO's Factory.
Steve's Reflect Armor: Chest on Rosa.
Steve's Zeranium Armor: Chest on Zerard.
Zegram's Lupine Coat: Chest on Vedan.
Zegram's Midnight Cloak: Complete MIO's Frog Log.
Zegram's Swordsman's Gi: Buy from Narcissus' Weapon Shop on Mariglenn.
Zegram's Wanderer's Coat: Chest on Juraika.

Dolgen Edge:
Successfully complete the Ghost Ship.

Truth Of The King:
Successfully complete the Ghost Ship Extreme level.

Hint: View treasure chests locations on the automap:
To see the locations of treasure chests on the map, you must first activate every teleporter on that particular planet. You will receive a message when you walk through the last teleporter. Treasure chests are shown as a yellow dot on the map.
Nicholas De Costa.

Hint: Easily weapons and armor experience:
Go to any area where you can kill the enemies with one shot using your blaster. Rosa works the best, but you can try other planets if you want better items. You will always get the same weapon/armor experience no matter where you go and no matter what you kill.
Brian Carpenter.

Hint: Chest key locations:
Nicholas De Costa.

Earth Key: Found in the Elder's hut in Burkaqua Village.

Star Key: Found outside Angela's Bar on Myna.

Sun Key: Found in the old man's house when you reach Johannesburg.

Hint: Viewing rare items:
As you start obtaining the rare items in the game, go to the Dorgenark and into Captain Dorgengoa's room. Look around and you will see the rare items that you have managed to get. For example, the Mirror of Truth will be hung up on the wall and the Annals of Hades will be on a nearby table.
Aaron Torrefiel.

Glitch: Wrong armor:
After Gale dies, you will see an intermission sequence where Jaster is speaking with Captain Dorgengoa. Notice that Jaster is wearing his default Rosa Armor versus the armor currently equipped.
Alan Alves.