This one took me the better part of an hour to do
Are You Afraid of the Dark? - Quicksave before using Phleg to open the gate, open it then quickly jump Phleg into a grinder before he's unpossessed, then simply escape to the FeeCo Main Lobby.
Oh, and no quicksaving until you're in the lobby
I also killed every Slurg in the game, I wish I'd been counting.