Try it with a different class. That's how I got it after I tried with some classes.
I think I was a Vanguard and I took James and Garrus with me. My bonus power was flare, I believe; and the map was the Spin Zone. Also I allow my squadmates use their powers on their own.
I don't use Biotic Charge+Nova. Instead, I charge and unload my clip (cyro ammo or incendiary ammo) to the enemy while going back and charge again, this triggers an explosion. I love when they shatter. Also I used Locust SMG and Paladin as my guns, along with Typhoon for James and Adas Anti-Synthetic Rifle for Garrus as their primary weapons. They were at level 5, if that would help.
That's the most difficult part of the game. Though the hardship varies according to your class, having enemies from different classes is really challenging.
Also try taking different squadmates with you. With your guns and mods at maximum level.
You should be able to deal with every defense type; shields, barriers, armor. For instance having squadmates with ammo powers could be useful; having a bonus power like energy drain that should replenish your shields / barriers, or flare for crowd control. I don't know if dominate works effectively against them, I never used that power.
After I got the achievement I didn't try it again yet

However; I'm planning to.