Under Siege
16 Achievements
PS3
Field Medic
Heal a total of 20000 hit points Details for this achievement will be revealed once unlocked
26.9%
How to unlock the Field Medic achievement in Under Siege - Definitive Guide
You should get this easily while playing thru the campaign. A good strategy in general is to have two groups of archers/shamans that heal each other, and that will build this number up fast too.