Not sure if a bug or intentional but on the map Underground I’ve completed half of the JOB ON THE SIDE mission (as Attacker) just by fixing 1 generator; the one (on last objective) that closes the access gates to the Defenders.
That mission is for doing 6 secondary objectives.
I joined late and only had the opportunity to do that one, nevertheless it counted as 50% of the mission.
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There is something funny about this mission. I had a ‘complete 5 side objectives’ and it went from 0-5 in one map (I only did one objective once iirc) and completed.
I don’t really like this mission, its to engineer heavy. Maybe, if we had more forward spawns to capture, and other types of side objectives (flip a switch anyone? - so what its easy to do, people will either play or grind missions either way), it would make more sense.
Unless I’m playing engy, this is ‘auto-X’ for me.
I dislike it too, the current maps (except Underground) aren’t built to make that mission easy.
I really dislike this mission as well and usually just drop the mission. Way too engi heavy and being the first at locations and such.
I can see the arguments for ‘engy heavy’ but engy mercs don’t have the equivelent of the water-boy mission (supplying ammo) etc. It is pretty hard to complete though (bar the bug above ;)).
thank you for posting! I was - tbh - rather clueless as to what events classify as a secondary objective. Shame on me … but now i know 
So … let’s see if i got diz right now … would the generators left and right of first plant (those needed for opening the doors) also count as a 2ndary obj?
Yes.
Primary objectives are placing the C4, fixing and getting the EV from point A to point B and carrying the ‘milk jugs’ to their final destination (hope I haven’t forgotten anyone)
Any other ‘constructables’ (or ‘destructibles’ if you’re on Defence) are secondary objectives.
My guess is that these are for the general casual player population, not for the focused ‘hardcore’ ones.