Here is the full list of all 13 My NAUGHTY Shotgun achievements.
The reaper is your friend
It probably wasn't worth it
I wonder what is inside
You surely know how to patch yourself
So much killings
Kill those demons!
You better not stand on it
It was about time
There is a first time for everything
To the ashes!
You got your first blood
Back to the ground with you!
He deserved it