During or after Chapter 7, select Leanne and look at the wardrobe in her room. Enter one of the following codes when she says "Hmm, I think that outfit is in here...", then press X to advance to the next line of dialogue and unlock the corresponding costume.
COSTUME - CODE
8-bit Girl - Press UP(2), DOWN(2), LEFT, RIGHT, LEFT, RIGHT, TRIANGLE, SQUARE.
Club Famitsu - Press TRIANGLE(2), UP(2), SQUARE(2), LEFT(2), L1, R1.
Gemaga - Press R2, L2, L1, R1, TRIANGLE(3), SQUARE(2), UP.
Hirakou - Press SQUARE, TRIANGLE, L1(2), R1(2), L3(2), UP, DOWN.
Platform Logo - Press LEFT, UP, RIGHT, DOWN, R1(2), L1(2), L3.
Politan Suit - Press R3(3), RIGHT, LEFT, TRIANGLE, SQUARE, L2, R2, L1. Note: You must get the Reindeer Suit in Neverland first.
Easy money hint:
In Chapter 6 or later, the Combat Scope Betas cost 3,000 gold, one glass shard, and one scrap of iron to make. The wandering merchant sells glass shards for 200 gold and iron scraps for 150 gold. Combat Scope Betas sell for 4,100 gold. So you will make 750 gold per scope sold. The best time to do this is chapter 6-7, before the merchant starts wandering she is always at the Waterless Bridge. In Chapter 8+, she can be at Forsaken, the Waterless Bridge, or the Righteous Tower. Get into an enemy counter, run away, and check the location to see if she is there. Time phase changes also alter her position. Repeat as desired.
Chapter 14 Dungeon Mystery:
In Chapter 14, when you go to the dungeon to fight the boss, nothing seems to happen. Run through the bottom section, go back to the dungeon map, and run around to the top entrance. Then, go all the way south through the dungeon again and there will be a switch sitting in the corner. Find and flip it. A gate will open, allowing you to return to the initial area. Go all the way southeast (backtracking through previous areas) and the boss will appear.
New Game +:
Complete the game to unlock New Game+ mode in which you can start a new game with some of your previously acquired items and skills. You can also change your costume in Leanne's bedroom.
Keep Reanbell in her current costume:
In Chapter two of a new game +, go into ReanBell's (Leanne) bedroom and press x at her wardrobe. There is a secret button which when pressed, will allow you to keep Reanbell in her current costume rather than going into the pig t-shirt in the cutscene.
First Contact - A trophy for defeating your first enemy.
Maiden Mission - A trophy for clearing your first mission.
Bonus Hitter - A trophy for landing your first Bonus Hit on an airborne foe.
Tri-Attacker - A trophy for using your first Tri-Attack.
Hundred Plus Club - A trophy for raising a character's level to 100.
Bullet Barrage - A trophy for landing a combo of over 500 hits.
Resonance Miser - A trophy for storing over Resonance Points.
Hero Actor - A trophy for attacking over 1,000 times during Hero Actions.
Spite Monger - A trophy for landing over 100 Bonus Hits.
Extreme Spiker - A trophy for performing over 100 Smackdown attacks.
Professional Hunter - A trophy for defeating over 3,000 enemies.
Material Collector - A trophy for destroying over 3,000 enemy body parts.
Thousand Pitcher - A trophy for throwing over 1,000 attack items.
The Iron Fist - A trophy for defeating over 30 enemies with no weapon equipped.
Big Shot - A trophy for dealing over 2,000 damage in a single attack.
Material Creator - A trophy for having fused and scapped items over 200 times.
Shopaholic - A trophy for spending over 500,000 rubies on clothing and accessories.
Customaestro - A trophy for connecting over 10 custom parts to a firearm.
Basels' Repairman - A trophy for making over half of Basel's hexes accessible again.
Four-Terminal Chain - A trophy for connecting four distinct terminals.
Prologue Complete - A trophy for completing the Prologue.
Chapter 1 Complete - A trophy for completing Chapter 1.
Chapter 2 Complete - A trophy for completing Chapter 2.
Chapter 3 Complete - A trophy for completing Chapter 3.
Chapter 4 Complete - A trophy for completing Chapter 4.
Chapter 5 Complete - A trophy for completing Chapter 5.
Chapter 6 Complete - A trophy for completing Chapter 6.
Chapter 7 Complete - A trophy for completing Chapter 7.
Chapter 8 Complete - A trophy for completing Chapter 8.
Chapter 9 Complete - A trophy for completing Chapter 9.
Chapter 10 Complete - A trophy for completing Chapter 10.
Chapter 11 Complete - A trophy for completing Chapter 11.
Chapter 12 Complete - A trophy for completing Chapter 12.
Chapter 13 Complete - A trophy for completing Chapter 13.
Chapter 14 Complete - A trophy for completing Chapter 14.
Chapter 15 Complete - A trophy for completing Chapter 15.
Clear the Game - A trophy for completing the game. Congratulations!
Lap Two Rush - Start New Game Plus
Unison Assault - A trophy for defeating two or more enemies in a single attack.
An Unfortunate Accident - A trophy for taking out your own party member in an explosion.
Tera-Driver - A trophy for loading over a terabit of data from the disc.
Disrespect Your Elders - A trophy for defeating the Elderly Man. He's with the stars now!
Basel's Liberator - A trophy for making all of Basel's hexes accessible again. Are you even human?!
Challenge Conqueror - A trophy for defeating the top-ranked team, the Last Line! Amazing!
Kings of Neverland - Finish Neverland.
The Legendary Hunter - You've completed every mission in the game! The legend will never die!
Stardust Hunters - You've got a ? in every rank!
Lap Two Complete - Beat the game a second time.
Platinum Trophy - Earn all Bronze, Silver, and Gold trophies.