walkthrough:ok first of all help out your teammates speed up the killing while doing so always stay on full hp
then when the harder ones come lure them to your right tower and atract them avoiding theier bullets and let the tower do the work when you have enough update your left tower into a ''Twin SpitFire Turret'' and now do what you done before but atracting the monsters to the middle. after that when you have enough update the right tower into a Twin Terminator turret then wait again and do the same to the left turret. when both your turrets are twin terminators then just let them do the work as they can handle off the monsters
now you save up for the elite gear and get Rocket launcher and Proton exelerator.
fill up your hp
go out on the battle field and line up with the enemies towers.
use the radar and don't come too close use rpg to destroy them (they disapear when dead)
if any monsters come use the P.A. to get them. once both towers are destroyed run towards the base and kill
too easy to complete but is worth it, and for you guys i also want achievements but for them we need to get greg here and for that we want to rate this 5/5
tip for the x4 damage achieave ment use meteor strike on some on the out side of the cluster of planets, but go really far out and darp don't wory if the pathway thing runs out it usualy goes strait if you make the line long
if your short on cash- go on lvl 1 and keep shooting the guy on the head full pelt-
when your done it like 20 times lvl up your health (more cash) when you got all 6 people max health you can start doing their accuracy and buying them weapons and youll wiz through the game
(you will get achiveaments this way)