Rocket Knight Cheats - Xbox 360

Unlock Characters
Enter [Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [B], [A], [Start] at the Title screen.

Achievements
Complete each achievement to get the allotted gamerscore:

Woodland Bouncer (5) - Defeat 3 enemies with a single reflected projectile.
Burst Friends (5) - Defeat 5 enemies in a single Rocket Burst or Drill attack.
Impatient Hero (20) - Completed all stages below par time.
Legendary Possum (20) - Completed Gold Sparkster Mode.
Devotindos Defiler (25) - Completed Arcade Mode on Hard in a Single Playthrough.
Elhorn Tourist (30) - Completed all stages.
Ferocious Flier (10) - Completed 1.2 having defeated all enemies.
Nimble Knight (10) - Completed 3.2 without taking damage.
Redoubtable Runner (15) - Completed Arcade Mode on Hard within 60 minutes.
Spark Dog Millionaire (15) - Completed Arcade Mode scoring 1,000,000 or more.
Wolf Connoisseur (10) - Completed 2.1 having collected all pickups.
Zephyrus Saviour (35) - Completed Arcade Mode on Normal.

Unlock Characters
Axel Gear - Complete Arcade Mode on Hard difficulty.
Gold Sparkster - Complete Arcade Mode on Hard difficulty.

Unlock Hard Mode
Return to Zephyrus - When fighting Axel Gear, catch him in the blast of his glowing purple orb attack.
Deep Underground - When fighting the Wolf King, destroy one of the crumbling platforms when he's standing on it, so that he falls to the floor below and gets damaged.
Wolf Kingdom - When fighting the Forest Shredder, reflect one of the sticks of dynamite it throws back at its face.