Mass Effect

It should be noted for all missions that even though the enemies are virtual, their weaknesses still apply based on their appearance. (So use shredder rounds for living enemies and Tungsten rounds for synthetics.) If you are a high level this will be very easy since most enemies cannot do much harm. Always remember your partners upgrades and abilities, much better to use all that is avaliable than trying to go it alone.
Basic Tips
You may get frustrated on the timed round where you have to kill a certain number of enemies in a certain times. The easy way is to play it through, figure out where it takes you the most time to get to spawned enemies, and the next time you play, send your partners there at the start of the match
Survival has a simple strategy, if you can revive your team. Once they die, sprint to the other side and revive them. Ducking down will almost garuntee your team will draw the enemies fire. (You have to make sure your team will stay in one spot or they will come to you and draw fire to you.) Try to take the enemy while they're distracted and keep up your team that way.
Hunting can be annoying, but all you have to do is learn the pattern. If you are having trouble with enemies that use immune, use your teamates abilities or just dont give them a chance to use it. One shot kills means they cant use anything, so using a shotgun with appropriate rounds will help a lot. And if you cannot down an enemy alone, kill every other enemy first so your squad will concentrate fire on him.
As for capture, just sprinting from point to point is really the best way, if you cannot find the points, spend one match just finding them then the next one take them. If you are constantly dying trying this, make sure your armor is upgraded (will shield enhancing of damage threshold increasing upgrades if possible.) If that doesnt work, make your squad go somewhere else to draw away fire from you and the point.
Any points I missed or strategies you think are better, give me a shout. Hope this helps.

I recommend going with capture. All you need to do on that is run to the first capture point, get it, run to the second, get it, and run to the third and get it. Don't seriously bother with fighting more than you have to. As soon as a point is captured, abandon the fight and run to the next capture point.

Once in Pinnacle Station, speak to the captian standing in the center of a very small circle platform in the center of the room you walk into, once you've spoke to him about the Combat Simulator go through the door next to the Turian (Alien) thats on the computer (the door is at the left side of the Turian) and talk to the Salarian on the computer at the far end of the room.

To get the achievement easily start the Combat Simulator on "Capture" then chose the map Tropical as its easy to navigate through. Once you know the map you'll breeze through this, just go to each of the 4 locations to capture them and your done .

I done this on casual difficulty
the enemy that spawn will try to bust a cap in your a** but it isn't really that hard.

Not sure but you have to beat the time of 1:58:00 i think and it took me two tries cause the first time i was just killing mostly.

All you have to do is try to run through the mission as fast as you can and don't kill to many enemy's as it will slow you down some.

Good luck and i hope this helped :)