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AZD-A9S said:
(see above)
Okay, finally nailed that Neighborhood watch achievement under normal difficulty. It would be so unchallenging if you know the trick that I almost want to make this a spoiler.

Only 3 certain striders in the whole battle would speed up and target 3 certain different houses, the speeding frenzy is not triggered by friendly casualties but is scripted and begins when they appear. Just target them first and you can take your time finishing off the rest. The first house is the sawmill, the second house is the big house with plenty of health on the east approach and the third is a small house on the west approach. And best of all, the final wave is not interested in targeting houses.

Now the problem is how to kill them. They also have hunter escort so you need to wait until they've left their escorts behind far enough (striders at max speed are much faster than hunter escorts). However, the escorts catch up shortly so you have a narrow window of engagement.

The very first sawmill is difficult because you have mere seconds to ready yourself after the death of the first strider (the second strider appears when the first one is dead or if you take too long). So it's best to load your car with a bomb, pick another one and kill the first strider, and race to where the second one stops to charge the cannon so you can pretty much ambush that thing.

There are stumps littered all over the scenario and they are ideal against the hunters.