I have a guide for this to solo it, with no deaths.
Note: you first need to play it for about 2 hours or less to unlock all the necessary weapons and abilities from the item boxes.Map:
Riot CannonHeavy Weapon:
Air Raid (or similar one, that has a jet vehicle mode)Ability:
fill all 3 with "Shield Restore Booster" if you have enough. If not, use "Energon Heal Burst"Hack:
When you start, you don't have any money. Focus killing the enemies from the upper platform with the riot cannon. If you die on the first wave, just restart. It actually gets easier once you upgrade everything. Shoot the blue money crates every time they spawn. You get the money even if you shoot them across the map. Go to the inventory selection (shown in video) to re-select your weapons if you are running out of ammo, to refill.
Now, when you have enough money, upgrade the Corrosive installations on both bridges to level 1, level 2 and finally level 3. These are your primary money wasters. When you feel you have enough money, install the rocket turret under the other bridge. Don't repair the Corrosives constantly, only just before a wave is about to begin or if there are lots of enemies left.
Most of the time the turret(s) and corrosion kill the enemies very fast, without them able to reach you. When the heavy warriors start to spawn, fly around the map and they often glitch and get stuck somewhere due to the bad programming. They sometimes even get stuck on the corrosive zone, taking constant damage.
If you take a lot of shield damage and are about to die, use the Shield restore booster with the d-pad and Repair sentry with
You are also guaranteed to unlock this achievement as well doing this: