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