Here is the full list of all 29 Double Dragon: Neon achievements.
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Defeat Skullmageddon!
Hit Skullmageddon with a hair pick
Use every weapon once
Collect one of each mix tape song
Upgrade a song at the Tapesmith
Expose the twin bulbs simultaneously
Catch a boomerang thrown by your bro!
Knock Abobo into a pit
Grab two enemies at once!
Knock Williams into a pit
Befriend everyone's most favoritest helpful character!
Grab an enemy out of the air 10 times
Defeat an enemy by unlocking his potential
Dodge and get the Gleam 50 times
Complete any level without taking any damage
You got 50000 on Double Dragon!?
Max out a single song to level 50
Break all of the Skullmageddon monitors in the Rocket Dojo
Defeat 4 enemies with a single bat swing!
Win an airlock battle without attacking
Nail all enemies with the hair pick
Complete any level in co-op without taking any damage... with friendly fire enabled!
Beat every level as a Ro-bro
Complete the game without using any Sosetsitsu!
Finish every stage cooperatively on Double Dragon difficulty with friendly fire enabled!
Max out every song to level 50!!
Finish every stage solo on Double Dragon difficulty!
Become the hidden idol!