Did you kill all opponents in one turn? i mean when they spawn (only 4 turn)

did you send ajay to both locks to open the bridge to the boss?

on my last play through of mission 3 I got 80% but by then I'd upgraded my mech's and pilots a lot and finished it much quicker than the previous attempt. I expect it comes down to speed / turn's taken to finish. Mission 1 and 2 I can finish in 1 turn with 1 mech by picking up the boosts but having 8-9 ap tons of energy and assault rifles makes pretty quick work of both of those missions.

ok, so even getting ace rank, completing in 3 turns, zero losses and all enemies killed and I still only get 80% completion? didn't receive any damage.. no idea how we can get 100% completion like the other missions.