By completing certain goals in the game, you'll unlock additional idols, powers, hearts, music, and other features. They can be viewed in the Treasure Hunt section of the menu between chapters.
| Unlockable: | How to unlock: |
| 100 Hearts | Use a Power. |
| 100 Hearts | Open a Treasure Box. |
| 100 Hearts | Acquire an idol. |
| 100 Hearts. | Die once. |
| 3,000 Hearts | Get finished 20 times. |
| 300 Hearts | Successfully perform a melee attack while riding a grind rail. |
| 300 Hearts | Play Free-For-All. |
| 300 Hearts | Acquire a club. |
| 300 Hearts | Use Fuse Weapons to create a weapon. |
| 5,000 Hearts | Use Fuse Weapons to create 20 weapons. |
| 500 Hearts | Clear 5 chapters. |
| 500 Hearts | Achieve a high score of 100,000. |
| 500 Hearts | Use 10 items. |
| Feather | Have 5,000 Hearts in your posession. |
| Feather | Play for more than 10 hours. |
| Idol: Boom Spear | Acquire a total score of 500,000. |
| Idol: Brawler Claws | Acquire 20 weapons. |
| Idol: Collin & Phil | Defeat 5 enemies with the Aether Ring shield before disembarking |
| Idol: Grenade | Acquire a staff. |
| Idol: Light Fighter | Play Light Vs. Dark. |
| Idol: Monolith | Defeat your first Souflee. |
| Idol: Pit | Achieve victory in Light Vs. Dark. |
| Idol: Shock Orbitars | Acquire a bow. |
| Idol: Snong | Have a weapon stolen by a Pluton. |
| Idol: Somewhat Staff | Play Together mode. |
| Idol: Space Pirate Captain | Defeat the Kraken with the Bullet Blade. |
| Idol: That First Town | Acquire a palm. |
| Idol: Volcano Arm | Perform a total of 50 dodges. |
| Idol: Wrecking Ball | Acquire a cannon. |
| Item: Capture Circle | Defeat an opponent in Together mode. |
| Item: Eggplant Bomb | Get turned into an eggplant. |
| Music: At the Safloor Palace (Ch.7) | Clear chapter 7 within 18 minutes |
| Music: Boss Fight 1 | Defeat your first boss. |
| Music: Ch.8: The Space-Pirate Ship | Clear chapter 8 with a score of 180,000 or higher |
| Music: Into The Labyrinth | Clear Chapter 5 within 18 minutes. |
| Music: Magnus's Theme | On Intensity 5 or higher, defeat Gaol without letting Magnus get taken down. |
| Music: Underworld Gatekeeper | In Chapter 9, destroy the Underworld Gatekeeper's guns and clear the chapter. |
| Power: Autoreticle Lv. 1 | Clear Chapter 1 within 7 minutes, |
| Power: Celestial Firework Lv. 1 | Perform an Idol toss. |
| Power: Confuse Attack Lv. 1 | In Chapter 5, defeat Pandora without letting Dark Pit get taken down. |
| Power: Counter Lv. 1 | Use the Centurion Assist item. |
| Power: Effect Recovery Lv. 1 | Play Far Away in Together Mode. |
| Power: Eggplant Attack | Get turned into an eggplant 5 times. |
| Power: Health Recovery Lv. 2 | Clear Chapter 5 within 15 minutes. |
| Power: Homing Boost Lv. 1 | Acquire an arm. |
| Power: Land Mine Lv. 1 | In Chapter 1, destroy 100 enemies and clear the chapter. |
| Power: Lightweight Lv. 1 | Clear Chapter 2 within 13 minutes. |
| Power: Mega Laser Lv. 1 | Acquire 5 different blades. |
| Power: Paralyze Attack Lv. 1 | Acquire 15 different weapons. |
| Power: Poison Attack Lv. 1 | Defeat 500 enemies. |
| Power: Quick Charge Lv. 1 | Acquire orbitars. |
| Power: Sky Jump Lv. 1 | Perform 100 melee attacks. |
| Stage: Forgotten City | ecover onto your feet from a knockback 10 times. |
| Stage: Rail Temple | Become an angel in Light Vs. Dark. |
| Stage: Spiral Tower | Acquire 10 powers. |
| Stage: Twilight Stratosphere | Play free-for-all 10 times |
| Weapon: Angel Bow | Collect over 10,000 hearts. |
| Weapon: Darkness Bow | Fire a total of 1,000 shots. |
| Weapon: Eyetrack Orbitars | Clear Chapter 2 using orbitars. |
| Weapon: Fairy Orbitars | Put over 10,000 hearts into the Fiend's Cauldron. |
| Weapon: Fortune Bow | Clear Chapter 2 within 10 minutes. |
| Weapon: Leo Cannon | Find the Leo Zodiac Chamber and take its treasure. |
| Weapon: Poseidon Cannon | Clear Chapter 8 in under 20 minutes |
| Weapon: Predator Cannon | On intensity 5 or higher, clear chapter 5 without dying |
| Weapon: Somewhat Staff | On Intensity 2.0 or higher, clear Chapter 5 using a staff. |
| Weapon: Thanatos Staff | Defeat Thanatos with the Volcano Arm |
| 2,000 Hearts | Clear Chapter 17 having defeated 280 enemies in this Chapter |
| 4,000 Hearts | Defeat your first Rare Treasurefish. |
| Feather | Clear 50 Chapters |
| Feather | Acquire a blade with a weakening modifier |
| Idol: Three Sacred Treasures | Perform 300 melee attacks. |
| Item: Tempura Bomb | Get turned into a tempura. |
| Power: Freeze Attack Lv. 2 | Acquire 5 different bows. |
| Power: Heart Booster Lv. 2 | Acquire 50 different weapons. |
| Power: Heavenly Light Lv. 2 | Acquire 5 different claws. |
| Power: Heavenly Light Lv. 2 | Acquire 5 different claws |
| Power: Instant Death Attack | Defeat 3,000 enemies. |
| Power: Invisible Shots Lv. 1 | Execute 500 dodges |
| Power: Invisible Shots Lv. 2 | Acquire 5 different clubs. |
| Power: Item Vacuum Lv. 2 | Clear Chapter 21 within 17 minutes |
| Power: Playing Dead Lv. 1 | Acquire 5 different staffs. |
| Power: Power Thief Lv. 1 | Collect 100 different Idols |
| Power: Quick Charge Lv. 3 | Acquire 5 different cannons. |
| Power: Reflect Barrier Lv. 2 | Use powers 50 times |
| Power: Trade-off | Defeat 50 bosses. |
| Power: Transparency Lv. 2 | Acquire 5 different arms. |
| Power: Weak-Point Reticle Lv. 2 | Acquire 5 different orbitars. |
| Weapon: Artillery Claws | Acquire claws with a shot-defense modifier. |
| Weapon: Atlas Club | Defeat 20 Souflees. |
| Weapon: Babel Club | Defeat 25 bosses. |
| Weapon: Boom Orbitars | Clear Chapter 25 within 15 minutes. |
| Weapon: Crusader Blade | Recover on yout feet from a knockback 50 times. |
| Weapon: Electroshock Arm | Open 50 treasure boxes. |
| Weapon: Hedgehog Claws | Have more than 50,000 hearts in your possession. |
| Weapon: Viridi Palm | Acquire 5 different palms. |
| Aquarius Blade | Ch. 23: When you get to your first grind rail that you have to jump, take it back in the opposite direction and ride it to the Chamber. |
| Aries Armor (Power) | Ch. 18: At the Hot Spring area with the Souflee, go to the left. |
| Cancer Claws | Ch. 8: In the constellation storage room, after defeating the Snong, don't take the Jump Pad. Take the dead end path to the right and jump down. |
| Capricorn Club | Ch. 20: When you get to the area that needs a key, go inside and take a right. Open the jail cell in the back left and go through the hidden wall. |
| Gemini Orbitars | Ch. 6: If you're lucky enough to fight Dark Pit in the underground temple, go check the temple's corners after defeating him. |
| Leo Cannon | Ch. 10: After sinking the pedestal into the lava (or jumping over it completely) go into the next room and follow the left wall. |
| Libra Sponge (Power) | Ch. 14: Once you get to the boss door, go in the opposite direction and you'll find an electric door. Get up close to the door and dodge through. |
| Pisces Heal (Power) | Ch. 24: When you take your first elevator to begin the trials, go down the other flight of stairs to find the Chamber. |
| Sagittarius Bow | Ch. 2: When you go down the ramp (Right before you meet Magnus), there is a tapestry decorating one of the bends. Run through it. |
| Scorpio Staff | Ch. 16: When you get the Aether Ring and float down an opening, look for an opening. Shoot the switch in that opening and you'll be able to enter. |
| Taurus Arm | Ch. 4: In the room with the narrow path and two scythes, drop down to the Clubberskull pit. One of the holes is glowing. Jump into that hole. |
| Virgo Palm | Ch. 12: There's an area that gives you an elevator after killing some monsters. Look towards it. A second elevator is behind you. Take that elevator. |