Persona 4 Golden Cheats

Game Over (Bronze): Secure Mitsuo Kubo
Going Nova (Bronze): Deal over 999 damage in 1 attack
Golden Completed (Platinum): Earn all trophies
Granter of Your Desires (Bronze): Buy 5 things from Tanaka's Amazing Commodities
Grasping at Greed (Bronze): Defeat a Golden Hand
Hardcore Risette Fan (Bronze): Hear 250 of Rise's navigation lines
Head of the Class (Bronze): Rank #1 in your class on an exam
It's Working Today (Bronze): Buy an item from the Capsule Machine
Legend of Inaba (Silver): Max out all Social Links
Lucky Me! (Bronze): Win a prize from the vending machine
Moderate Bookkeeper (Silver): Register over 50% of the Compendium
Movie Buff (Bronze): Go to 3 movies at 30 Frame
Mr. Perfect (Silver): Max out all social qualities
One Who Has Proven Their Power (Gold): Defeat Margaret
Persona Shopper (Bronze): Buy a Persona from the Compendium
Seize the Moment (Bronze): Buy a special croquette from Sozai Daigaku
Skilled Commander (Bronze): Perform 50 All-Out Attacks
Special Fusion Expert (Bronze): Use 4 or more Personas in a special fusion
Tactical Fighter (Bronze): Exploit enemy weaknesses 100 times
The Lounge Is Closed (Bronze): Rescue Rise Kujikawa
The Nose Doesn't Always Know (Bronze): Experience a fusion accident
The Other Self (Bronze): Obtain the Persona Izanagi
The Power of Truth (Silver): Create Izanagi-no-Okami
The Reaper Becomes the Reaped (Silver): Defeat The Reaper
The Return of the Angels (Bronze): Rescue Nanako Dojima
The Truth In Your Hands (Gold): Defeat Izanami
Thorough Bookkeeper (Gold): Complete the Persona Compendium
Welcome Back (Silver): Rescue Marie

Secret Midnight Channel
When the clock of the Vita is between 12:00 (Midnight) and 1:00, Go to the TV Listings section. Once there, find the blinking channel with the flashing lights, touch/select it and you will find a minigame with Teddie.