i still can't get the last one...i can't beat Akasha by myself and i can't find any way to get two other bots with me...i used the backup card, but i'm still alone with Akasha...
Edit: Got it today, using a simple method, that you can find in this video
It doesn't matter how you get to the hiding spot, just get there with a frag above her.
The only difference is that you would have to dodge her when she goes for the pulse rifle because you can't crouch and she will fire upon you with great accuracy.
I killed her once, hid in that spot with only 8 life points left and waited/dodged for 20mins.
It also works if you replay Chapter V and use the difficulty trick.