And for those Kill X patrol missions, so long as you get at least a shot in on them it counts. Sometimes for me if I'm even near the enemy when it dies it still counts.
So that makes it easier and what the OP does actually helpful in many ways.
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You're right. I just invaded some random Titan's personal space as he ran around killing things and it counted. TC and others are more than welcome to murder misunderstood aliens with impunity.