Speaking with Alfgar needs a requirement for the assault event. I tried it a 3rd time and nothing.
Most likely it is rank based. My sidekicks are both 35 con and phys under 30.
Update for 1.18b done in somw minutes.
But i don't know what new other quest achievements could be exist, because there isnt any quest besides the "Heat is on" event. 1 quest and 5 items.