Some of the Hero Boosts annoy me. Mainly the ones about playing a certain team for an entire map cuz most of the leaders of said team have sucky stats in defense (ie: Storm and Mr. Fantastic). I found the cheapest way to get Penance's Hero Boost for the taking 612 damage is fighting the helicopter during the convoy mission (Pro, don't remember if there's one for Anti). Just step into the bullets from the copter since it only takes 1 damage per bullet but it takes sometime cuz of the grenades.