Here is the full list of all 12 Aegis Wing achievements worth 200 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox 360.
Form a four-ship (Epic) formation.
Complete a level without taking damage.
Complete a level without firing.
Complete the game on Insane.
Finish Mission 3 on any difficulty.
Complete the game on Normal.
Earn 30,000 points.
Complete a level without dying or losing any allies.
Score 10,000 points while attached in a level.
Earn 100,000 points.
Earn 185,000 points.
Destroy all enemies in a level.