Successfully complete the game to unlock the "Concept Art Gallery" option at the main menu.
Press Start at title screen.
Successfully complete the game under the Dragon difficulty setting.
Successfully complete the game under the Normal difficulty setting.
Set Fuzz Face free by dodging seven times between the two tombstones next to the ladder in level 6, "Assault Zone". Fuzz Face will now follow you and drop Dragon Kick and batteries occasionally.
Hold LB + LT + RB + RB + Back + Start + click Left Analog-stick + click Right Analog-stick at the level selection screen. A sound will confirm correct code entry. Note: This gives you the robot form costume without the extreme power up. Repeat the code to disable its effect.
Play level 7, "Some Kind Of Lab". Punch the heavy bag in the glass cell where you start 87 times until a chime sounds. After a few seconds and your head and others will be replaced with Yoshihisa Kishimoto's face.
| Achievement | How to unlock
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- Are You Awake? (10 points)
| - Win an airlock battle without attacking.
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| - Collect one of each mix tape song.
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| - Hit Skullmageddon with a hair pick.
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| - Catch a boomerang thrown by your bro!
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| - View all pages of the concept art gallery.
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- Double Dragon (40 points)
| - Finish every stage cooperatively on Double Dragon difficulty with friendly fire enabled!
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| - Befriend everyone's most favoritest helpful character!
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| - Dodge and get the Gleam 50 times.
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| - Defeat 4 enemies with a single bat swing!
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- High Fidelity (10 points)
| - Max out a single song to level 50.
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- Is That a Quarter? (5 points)
| - Knock Williams into a pit.
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| - Expose the twin bulbs simultaneously.
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- Later Ro-bros! (20 points)
| - Beat every level as a Ro-bro.
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| - Max out every song to level 50!!
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| - Upgrade a song at the Tapesmith.
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- Misters Perfect (20 points)
| - Complete any level in co-op without taking any damage... with friendly fire enabled!
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| - Complete any level without taking any damage.
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- Pick a Winner! (15 points)
| - Nail all enemies with the hair pick.
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- Put Your Heads Together (5 points)
| - Grab two enemies at once!
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- Single Dragon (50 points)
| - Finish every stage solo on Double Dragon difficulty!
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- Skullmageddon's Curse (1 points)
| - Nyah ha ha! Now finish what you have started!
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- The Key to Victory (5 points)
| - Defeat an enemy by unlocking his potential.
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- This Channel Sucks (10 points)
| - Break all of the Skullmageddon monitors in the Rocket Dojo.
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| - Complete the game without using any Sosetsitsu!
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- Tossin' on Air (5 points)
| - Grab an enemy out of the air 10 times.
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- You Did What!? (10 points)
| - You got 50000 on Double Dragon!?
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