Here is the full list of all 27 Night Blights achievements.
Earned 21 Stars
Found the Blight Cave
Earned 18 Stars
Saved Robo Chris
Got locked in the car
Completed Sunday
1 Shot 2 Blights!
50 kills on Sunday
Completed Saturday
Earned 15 Stars
Killed your first Blight
25 kills on Sunday
Completed Friday
No sprint on Wednesday
Completed Thursday
Harassed by Teddy
Completed Wednesday
Killed by a Blight
Completed Tuesday
Completed Monday
Fed your first Blight
Found the toy source
Score with a toy
Play Survival Mode
Survived until 2am
Survived until 3am
Survived until 4am