Here is the full list of all 20 Night Sing achievements.
Kill a zombie for the first time
Hey! Don't put something that dangeous on the street!
Remy didn't go to the church
Kill the crocodile
Kill a zombie with explosive
Kill a human for the first
Slay a vampire for the first time
Get present from Wong
Defeat the Legion
Complete the game with the Vampire ending
Defeat Heclery
Why the heck did I save that blonde dude?
Enter the Room of Xuan Young
Walk through the corridor with the armored car
Kill Mira the Zombie
Ranked E or lower in Challenge Mode
Ranked B or higher in Challenge Mode
Ranked AAA in Challenge Mode
Reached 90% headshots in Challenge Mode
Miss 10% or less shot in Challenge Mode