Meet the conditions below to complete the associated challenge condition.

Challenge	How to unlock
Air Shoes	Beat the game without falling into any holes.
Almost Invincible	Beat the game without continuing.
Blue Bomber	Beat a boss without being damaged.
Bunny Hop	Jump 50 or less times in a stage.
Bust A Move	Every shot with the Mega Buster must hit an enemy throughout the game.
Conqueror	Beat 100 enemies.
Conservationist	Beat the game by only using the minimum amount of weapon energy.
Daily Dose	Beat the game one a day (at least) for 3 straight days.
Destroyer	Beat 1,000 enemies.
Double Trouble	Visit all stages twice and beat the game.
Eco Fighter	Beat a boss only by using the Mega Buster.
Encore	Beat 4 stages when using the same special weapon.
Fantastic 9	Earn 9 lives.
Farewell to Arms	Beat 4 stages without the use of a special weapon.
Fully Unloaded	Hit a boss at least once with all of the special weapons.
Gamer's Day	Beat the gane 5 times within a day, a day being from 12:00 AM to 11:59 PM.
Hard Rock	Get to a boss's room without being hurt at all.
Headbanging	Beat 8 bosses without the helmet.
Heavy Metal	Get to a boss's room without shooting any weapons.
Invincible	Beat the game without dying.
Jitterbug	Beat the game in under 1 hour.
Last Man Standing	Beat all bosses while one pixel of your health remains.
Marathon Fight	Fight a boss for a length of ten minutes.
Mega Diet	Beat the game without picking up any more than 8 energy pellets.
Mr. Perfect	Finish the game without getting damaged.
Mr. Trigger Happy	Use 500 or more Buster shots throughout the whole game.
No Coffee Break	Beat the game without the use of Energy or Mystery Tanks.
Pack Rat	Collect 999 screws.
Peacekeeper	Beat the game by defeating only bosses and minibosses.
Quick Draw C	Defeat Concrete Man in under 10 seconds.
Quick Draw G	Defeat Galaxy Man in under 10 seconds.
Quick Draw H	Defeat Hornet Man in under 10 seconds.
Quick Draw J	Defeat Jewel Man in under 10 seconds.
Quick Draw M	Defeat Magma Man in under 10 seconds.
Quick Draw P	Defeat Plug Man in under 10 seconds.
Quick Draw S	Defeat Splash Woman in under 10 seconds.
Quick Draw T	Defeat Tornado Man in under 10 seconds.
Quick Draw X	Beat the final boss in under 3 minutes.
Shop A Holic	Purchase 30 items or more.
Speed Metal	Reach a boss's room without letting go of the D-Pad.
Survivor	Beat one boss while one pixel of your health remains.
Tango	Beat the game in under 1.5 hours.
Truly Addicted!	Beat the game 10 times.
Truly Hardcore!	Beat the game 30 times.
Trusty Sidearm	Defeat all eight bosses using the Mega Buster.
Valued Customer	Buy all items.
Vanquisher	Beat 500 enemies.
Waltz	Beat the game in under 2 hours.
Whomp Wily	Beat the game a single time.
World Warrior	Defeat all types of enemies.