I unlocked 7 and 11 at the same time, so one of them is
Trust Me, I'm a Doctor
Have 30 points in Treat Injury.
and the other is
Silent, But Deadly
Have 30 points in Stealth
But I don't know which. I think this is Stealth.
For either, one of the party members must have the skill as a class skill. Visas or Kreia are good for these two. Max the target skill each level, and you will have 30 ranks at level 27.