I normally get 4-6 medals, 2.5k heal, 75k healed, 1k and 3k defender, Killing Blow, 10 kills. If im lucky ill be able to get 25 kills.
Throw a few grenades, try to put out some decent damage before enemies reach you/your teammates. Im only 32 and if i can keep playing as i do now it should be possible to get a few more medals.
But i would agree that healing should count for kills, but then DD's will start QQ'ing since they get fewer kills than a healer....