For a Soldier, it's all about Immunity for 3 minutes in Survival mode. I bring Ash and Wrex to tank this, and it is the easiest mode for the Soldier, the problem is dieing once you have enough time logged, so send the squad to one spot of the map and then move to another, and take off any armor mods to speed up the process.
Time Trial, I've had success bringing Ash and Garrus or Wrex to kill as quickly as possible, if you can take them out before mercs/pirates activate Immunity, you should be okay. And this one could take a few trials to perfect timing, these are hardest because you need to perfect which path you take to maximize your killing speed, so that the enemy does not spam Immunity on you, which can bog you down.
Hunt, again, I like Ash and Garrus to max damage and their dead-eye sniping is needed here for the Mercs. Geth are pretty easy, just be mindful of their melee if you get too close and don't have much invested in Combat Armor or have something solid.
Capture is the second easiest, once you know the capture points in a level. You can basically ignore the enemy in this mode, until you get inside a capture point, where you just need to keep the enemy outside of the circles.
Colossus Armor and Spectre makes it possible to beat this on Insanity, but if you are unfamiliar to the layouts it's gonna take a few tries to perfect your timing.
And you would need to be a higher level with solid mod selection for weapons and Armor.
Frictionless and Inferno is what I've used the most, and then I like the high end, Damage Protection boosting armor mods.
There some other notes on this page, too.
masseffect.wikia.com/wiki/Pinnacle_Station:_Combat_MissionsHope this helps.