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