Rogue Trooper Redux

OK, after a few issues with this level, I finally found a way to "Fudge It" and make it much easier.

When you start, move back into the doorway, then deploy Gunnar at the bottom of the ramp. This will take out most of the ground troops, leaving you and your pistol to take out the heavy mech that fires rockets from the left side. It take a few clips (5 or 6) but you are out of its reach and it will go eventually. Once this is done go to the first terminal up the ramp on the right.

Before you go up the ramp place Gunnar at the bottom again, so it can deal with the rif-raf. Once you place Helm onto the console go to the back (either side) and gently move to the edge of the opening. This will make you drop down and hang onto the ledge (this is the "fudge"). Once there the enemies do you no damage (or very little) and you can wait until the console is hacked. Once done, jump up and get Helm back, but don't rush forward yet. Clear the area ... watching out for the 2 snipers that appear top left and right, then go and plant a charge over the bridge and detonate it. - 1st Checkpoint

Now before you move to the next terminal on the right, go back up to the 1st terminal area and pistol the next heavy mech that appears. His rockets kept hitting the wall and did me no damage. Once the area is clear move onto the next terminal doing the same thing again. Drop Gunnar, Plant Helm, Hang off ledge etc. This time before you cross the bridge there are a few turrets that have been dropped - grenade them. Once clear go over to plant charge and detonate - 2nd Checkpoint

Last area is the same again, just with different enemies. This will drop those awful flying bombs that will take you out, but with Gunnar at the bottom of the ramp and the "hang over the edge" trick, I didn't have to deal with them. Once complete same again - clear area then plant and detonate - Achievement

Enjoy