Here is the full list of all 12 Verdict Guilty achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Beat Gun's story mode
Beat Siu's story mode
Beat Yohan's story mode
Beat Minso's story mode
Beat Reese's story mode
Beat Jae's story mode
Beat Hyuk's story mode
Get 4 wins in survival mode
Beat arcade mode
Defeat an arcade opponent in under ten seconds
Beat Gyeong's story mode
Perform a 7 hit combo in arcade mode