F.E.A.R. 3

To get this achievement you have to play co-op as Point Man. You must kill 100 enemies that are suspended by your brother Fettel (Co-op partner). Make use of slo-mo on these kills if you want to make sure you kill them before they are no longer suspended and to work your way to "God Among Men".

I would recommend from the very start of the game to start going for this achievement (Minus where you get "A Precursor") so you can get it out of your way. It is also a lot easier in the beginning of the game. If you only go for these kills from the start you will get the achievement during the second level.

Both of the Brother's helper achievements can easily be gotten with natural play. By the end of my first run on co-op I still needed them both. So for anyone who needs to get these quickly, I found the best level to either start and or finish these achievements off, is on the Bridge/Interval 6. There are tons of enemeies right near the start with the demon hounds and then 2 Phase Casters (blue guy) shortly after. Just keep letting the Phase Casters keep spawning in soliders for you to suspend and kill. He will eventually stop sending them out, but it will take a while. Once he does, just kill him. There is another Phase Caster right near the first Mech suit of the level. Again, these achievements really are easy to get with natural play. So I would just suggest doing this method after you finish the campaign, unless you just really can't wait.