First, I remember reading about achievements that didn’t unlock if you weren’t playing as Keegan, and Trueachievements doesn’t have a guide for this, so my question is:
Can I play as Mac (I’ll play alone and on Inconceivable) and get the achievement for completing it on Insane?
I’ll play for the challenge, but I’m not interested in play Incon and Insane if the achievement only unlock for Insane.
you should be able to get the insane achievement if you do it on incon.
I played UE on insane and it gave me the achievements for the lower difficulties.
Yep, Mac is easily the best choice for Insane/Inconceivable playthroughs. It’s what I did. You can spam Lahni’s Ulitmate, which is really helpful as she rarely goes down and it keeps enemies back. Keegan’s re-supply spam is also useful. Of course, you then have your barrier for personal use and for those tricky moments.