| Achievement | How to unlock
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|---|
| <3 | Obtained the Life Pot!
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| A Fine Blade | Obtained the Blade!
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| A Gift from Santa | Obtained the Fireball!
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| Arm Bar | Obtained the Arms Barrier!
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| Armored Feline | Defeated monster x!
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| Ate A Red Flower | Defeated toroko...
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| Big Fish | Defeated ironhead!
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| Boss Attack A Rank | Completed Boss Attack in Less Than 10:00.
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| Boss Attack B Rank | Completed Boss Attack in Less Than 12:00.
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| Boss Attack C Rank | Completed Boss Attack in Less Than 15:00.
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| Boss Attack S Rank | Completed Boss Attack in Less Than 8:00.
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| Cave Story Clone | Defeated g-clone!
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| Cold Hearted Snake | Obtained the Snake!
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| Count to 290 | Obtained the 290 Counter!
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| Coward | Bad ending
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| Curse Broken | Best ending.
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| Doggy Style | Beat Omega with Jenka's Puppy.
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| Don't Get Lost | Obtained the Map System!
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| Ducking Awesome | Obtained the Nemesis!
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| Evil to the Core | Defeated the Undead Core!
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| Fish Preserve | Spared eggfish.
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| Freakin' Laser Beamz | Obtained the Spur!
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| Ghost in the Clinic | Defeated puu black!
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| Girly Gun | Obtained the Machine Gun!
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| Happy Birthday Pixel! | Played Cave Story on April 29th!
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| Hate Made Flesh | Defeated ballos!
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| Heart of the Island | Defeated the Core!
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| Heavy Medal | Defeated the Red Ogre!
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| Here's Johnny! | Obtained the Alien Medal!
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| Home, Sweet Home | Returned Mister Little back home.
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| House Call | Defeated the Doctor!
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| Huge Toad | Defeated balfrog!
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| I Like It Hard! | Completed hard mode.
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| I'm Juggernaut... | Found and collected all Life Capsules.
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| I've Got Your Back | Obtained the Iron Bond!
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| Kings of Power | Accumulated XX,XXX of damage.
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| Ladies' Man | Obtained chako's lip stick!
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| Little Man | Found mister little!
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| Machine Monster | Defeated omega!
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| Magic Missile | Obtained the Missile Launcher!
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| Mimiga Bodyguard | Defeated curly...
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| Mimiga Hero | Mask mimiga ending.
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| Miserable | Defeated misery!
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| Mr. Clean | Obtained the Bubbline!
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| Muscle, MD. | Defeated the Muscle Doctor!
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| Only If You're Greedy... | Defeated the Twin Dragons!
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| Panty Raider | Obtained curly's panties!
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| Pea Shooter | Obtained the Polar Star!
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| Rabid Mimiga | Defeated igor!
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| Return the Favor | Saved curly brace.
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| Rock Bustin' | Defeated balrog, yet again...
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| Sanctuary A Rank | Completed Blood Stained Sanctuary in Less Than 4:00.
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| Sanctuary B Rank | Completed Blood Stained Sanctuary in Less Than 5:00.
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| Sanctuary C Rank | Completed Blood Stained Sanctuary in Less Than 6:00.
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| Sanctuary S Rank | Completed Blood Stained Sanctuary in Less Than 3:00.
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| Shtuff Happens | Normal ending.
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| So easy, so so easy! | Completed easy mode.
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| Supa Star! | Obtained the Whimsical Star!
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| Super, thanks for asking! | Obtained the Super Missile Launcher!
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| Swollen Mech | Defeated heavy press!
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| To Hell and Back | Completed blood stained sanctuary.
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| Toroko Wins! | Beat by Toroko.
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| Tow Me A Rope | Obtained the Tow Rope!.
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| Turbocharged! | Obtained the Turbocharge!.
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| Unstoppable | No life capsules (best ending).
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| Untouchable | No life capsules (good ending).
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| Wanna Fight? | Defeated balrog!
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| Weapons of Mass Destruction | Found and collected all Missile upgrades.
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| What A Fun Guy! | Obtained ma pignon!
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| What Are YOU?!? | Defeated balrog, again...
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| Who's the Boss? | Completed boss attack.
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| Wind Fortress A Rank | Completed Wind Fortress in Less Than 5:00.
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| Wind Fortress B Rank | Completed Wind Fortress in Less Than 6:00.
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| Wind Fortress C Rank | Completed Wind Fortress in Less Than 7:00.
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| Wind Fortress S Rank | Completed Wind Fortress in Less Than 4:00.
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