Quote Originally Posted by Unregistered View Post
If you pay attention to the result screen after clearing a mission the 3 requirements are there

1. Quest Clear (finishing even with 1 life left)
2. Kill Rate 100% (all enemies killed)
3. Allied Unit Deaths 0 (no one died, withdrawing and letting life fall doesn't count against this as long as it doesn't hit 0)
Actually, that's wrong. 2 Star means none of your units die as well not required to kill all enemies. You can let go enemies to your base camp.