Yep Headshots are the way to go. If you're using the sniping scope watch how it bobs up and down to your hearbeat and fire as it's turning back (is there a way to hold breath? I didn't notice one).
You don't have to kill everyone, but I like to. I really enjoyed stealthing about and popping up to take them out 1x1. If they start figuring out where you are, sneak up behind them. I found the AI rather stupid in figuring out which way fire was coming from.
Use the enemy guns, easier to get ammo and you can detach all the things off your scar and pop them onto the enemy gun so it's more or less the same thing.
I didn't use shotguns much, until the end vs the aliens.
You can stealth about places and hide yourself inside tree's and bushes, or behind fences to charge your power back up.
Helicopters have thermal imaging, keep cloaked while they're about and shoot them down with misisle launchers (you can double-triple tap and fire them rapidly, then hide behind a boulder as they shoot back).
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