Out Hunt the Hermit - Defeat more enemies than The Hermit. - 3500 Plex.
Silent Sage - Complete mission without using a Sage Ability. - 1500 Plex.
You have help, but there are quite a few more Middlemen this time around.
If you want to get Out Hunt the Hermit, go after the enemies he isn't attacking. If you're fast you can outpace him.