573 Continues (Rising or Arcade Mode)
Press (Up, Up, Down, Down, Left, Right, Left, Right, X, Circle) during unpaused, regular play within a stage to raise the number of continues to 573. This works in both Arcade and Rising modes, and carries over across modes / characters until the game is quit through the PS3.

Contra Stage 1 Music
During the loading screen for mission 1, input the konami code to have a remix of stage 1 from Contra 1 played throughout the level. The code is Up, Up, Down, Down, Left, Right, Left, Right, X, O. The announcer will say "Let's Rock," confirming that the code works.

Trophies
There are 7 Bronze Trophies, 4 Silver Trophies, and 1 Gold Trophy.

All Clear (Bronze): [RISING MODE] Clear all missions
Burning Spirit (Bronze): [RISING MODE] Achieve the highest rating on all stages
Decorated Soldier (Bronze): [RISING MODE] Obtain all medals
Disposable Warrior (Silver): [ARCADE MODE] Stock up 20 or more extra lives
I'll make them pay... (Gold): [ARCADE MODE] Clear all missions without dying
Innate Guerilla Warfare (Silver): [ARCADE MODE] Clear all missions without defeating more than 50 Privates.
Let's do this thing right! (Bronze): [ARCADE MODE] Defeat 10 or more Privates
Stage Clear (Bronze): [ARCADE MODE] Clear Stage 1
The definition of a warrior! (Silver): [ARCADE MODE] Clear all missions without picking up any weapon items
The Strongest Warrior (Bronze): [ARCADE MODE] Clear all missions
World Peace (Silver): [ARCADE MODE] Clear all missions with friends from around the world
You can never play too much. (Bronze): [RISING MODE] Purchase all obtainable item

Game info
publisher: Konami
developer: Arc System Works
genre: Action