Hunted Demons Forge

The solution is pretty easy: Use E'lara's Arcane Shot or Caddoc's Dash ability to destroy the shields of your enemies.

The problem is in the execution. You pretty much have to hit the shield center mass, while it's facing you. Basically when said enemy is bearing down on you with the shield lowered to block your attacks. You're AI partner will be more of a hinderance, either killing or distracting enemies so they don't face you down and present the shield for destruction.

So an easier method is to do it in Cruicible.

Create a one room map and set it each of the nine enemy spawns to 100 of your favorite shield bearing enemy. I picked the Wargar Guardians, the ones with the big razor spine and are really tough to kill. They can take a few hits and there's more than Caddoc can distract, allowing you destroy the shields of enemies getting past him.

If they don't immediately lower their shield for you to destroy it, shoot them once then'll they do it. Just remember to stay on the move and dodge when they get close to hitting you.

real easy way of getting this play as E'lara and buy her armor piercing shot as you upgrade it it gets strong enough th break virtually all shields in one shot just be careful when you aim if you hit the enemy they will most likely die

Another easy way off getting this.play chapter 1.6! It´s the boss fight. After the fight load the chapter again until you got it!
Note:
Use E'lara's Arcane Shot or Caddoc's Dash ability to destroy the shields of your enemies.
Hope this helps:-)