Incendiary
Banned
I have no idea how I got that one. I don't know what I have to do to get the Homerun Trophy, either.
Don't know about Home Run yet, but spoilering how the Touchdown one pops just in case:
The super mutant suiciders run at you holding bombs like footballs. If they reach you, blow up and kill you, the Touchdown trophy pops. I think the super mutant even yelled "Touchdown!" or something similar when it happened to me, but I'm not 100% on that.