Here is the full list of all 20 Double Dragon Gaiden: Rise Of The Dragons achievements.
Unlock more than 6 playable characters
Earn 10 tokens in a single session
Trigger Crowd Control x5 for the first time
Perform more than 25 Crowd Control in a single session
Clear your first mission
Trigger Crowd Control x3 for the first time
Trigger Crowd Control x4 for the first time
Defeat Killers in Mission 4
Defeat Royal in Mission 4
Defeat Triangle in Mission 4
Defeat Okada in Mission 4
Achieve Ending A
Achieve Ending B
Special KO 3000 enemies across multiple sessions
Crowd Control 100 times across multiple sessions
Hold on to more than 100 tokens
Perform more than 600 Special KO in a single session
Unlock more than 20 artworks
Unlock more than 20 soundtracks
Unlock all other achievements