Here is the full list of all 12 Bloody Good Time achievements.
Finish a match as each character
During a Hunt or Elimination scene, kill your Hunter 3 times in a single round
Win a match on each level
During a Scene Stealer scene, hold onto the statue for 60 seconds without being killed
Earn 200 Stars in your career
Commit your first murder
During an Infected scene, pass on your infection in the final 5 seconds and end the round clean
Escape from Security with a 10 Star fine
During a Hunt the Leader scene, survive the whole round as the Leader without being killed
Commit a perfect murder (boast, 5 star kill, humiliate)
Earn 2000 Stars in your career
Win a match without being killed