So i cant finish this stupid quest because it is out of my skill level to kill 4 people in one invasion, especially since people just run and hide because i can see them through walls, so unfair
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The quest is designed so that even if you lack the capacity to get an army of one medal (something I guarantee you are capable of though it might take practice), you can still finish if teammates do it for you on three separate occasions.
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I usually did the invasion for my teammates since it also states as well that a team mate can do it 3 times
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As other said just keep playing. You will get it eventually. I rarely invade (usually only when the boss stomps me into the damn portal) So, I was able to get mine with another player invading and getting 4 kills enough times.
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Just keep playing and you'll either get the 4 kills or a teammate will get 4 kills 3 times. I completed it yesterday getting 4 kills with the thunderlord.