8/9 missions in Devil's Razor. Have completed the following:

[Beedle]

Baby Dancer.
Boom Boom Boomtown.
Buff Film Buff.
Discover the Trial of Survival.
Dynasty Dash: Pandora.(completed twice)
ECHOnet Neutrality.
Life of the Party.
Sheega’s All That.
The Feeble and the Furious.
Wildlife Conservation.

I am wondering if it might be something from the bounty board in Sanctuary. I saw some quests there in a friends match one time, but they are not there in my solo play.

[Hemmis]

You have listed the ones required to complete them all, Baby Dancer, Boom Boom Boomtown, Buff Film Buff, Dynasty Dash: Pandora, ECHOnet Neutrality, Life of the Party, Sheega’s All That, Wildlife Conservation and The Feeble and the Furious. Do they appear in your completed quest list? Did you do them all in solo play?
Dynasty Dash seem to bug out a bit for some, try doing it again.

[Beedle]

It was the mission Childhood's End which starts, and is mostly done in, Konrad's Hold, it is completed in Devil's Razor.