So I was in SoR borderlands last night, defending the garrison. For over an hour SoR just constantly kept assaulting the keep and we had to stay on defense, so for the entire hour I was getting the achievement for defending the keep against the attackers.
I noticed something strange though, the defense event didn’t give any credit towards my daily or monthly achievements.
Now defending everything else seems to give credit, from stonemist to supply camps. But none of these keep defense events counted towards my monthly or daily