| Achievement | How to unlock
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| - 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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| - 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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| - Max out a single song to level 50.
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| - Knock Williams into a pit.
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| - Expose the twin bulbs simultaneously.
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| - 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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| - 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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| - Nail all enemies with the hair pick.
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| - Grab two enemies at once!
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| - Finish every stage solo on Double Dragon difficulty!
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| - Defeat an enemy by unlocking his potential.
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| - 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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| - Grab an enemy out of the air 10 times.
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| - You got 50000 on Double Dragon!?
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