I plan on making guide videos, but my general strategy when doing the 2* Be More Objective was
1) The moment you spawn sprint to the Charge spot and plant, then back up and cover it w/ Assassult Rifle
2) I plant a mine at the stairs enemies use and crouch while repairing, it seems the bots have trouble shooting crouched players
3) Hacking one can be really annoying, I suggest throwing a grenade to clear the point, planting the box then walking around the structure to stay alive, only popping out when an enemy approaches the hack box
4) I can't exactly remember my path, but I believe I jumped on top of the boxes outside where the intel is, jumped-mantles to the walkway, ran up the stairs and made a mad dash for the objective
On a side note: Remember to go for the head, the art style makes heads really easy to hit on the bots, as they normally just walk around, I suggest one of the more accurate assault rifles
Hope this helped