In AV, just loot everything you see, you will eventually get the picture. Recapping towers can prove difficult if you go along solo. Check your map and see if you have others trying to defend and spam the heck out of the flag, you'll get your 50.
Same can be said for retaking AB nodes. Overcoming a 500 point deficiency comes down to luck, or having a premade specifically going for it. Just give it time, it will happen.
In Strand, at the dismay of your teammates, just plant bombs at the beach gates using bombs from the docks. Usually once a door is broken the defense will fall back to the next level leaving you free to plant bombs at your hearts desire. As for killing tanks with turrets, I dont know if its a bug or intentional, but so long as you do some damage to the tank with the turret, and the tank is destroyed while you are still in the turret (despite you not giving the killing blow), you will get credit.
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