Here is the full list of all 15 Muv-Luv achievements.
Saw Sumika ending in EXTRA
Saw Meiya ending in EXTRA
Saw Chizuru ending in EXTRA
Saw Kei ending in EXTRA
Saw Miki ending in EXTRA
Saw Common End 1 ending in EXTRA
Saw Common End 2 ending in EXTRA
Saw all possible endings of EXTRA
Started Unlimited
Saw one possible ending of Unlimited
Saw all possible endings of UNLIMITED
Took five Drill Milky Punches to the face
Unlocked Jukebox mode
Completed the CG Gallery
Started Muv-Luv!