This achivement is earned after completing all 12 story mode levels. Here are the list of levels:
Prologue - Battle of Endor
Chapter 1 - Assault On Jakku
Chapter 2 - Escape From The Finalizer
Chapter 3 - Niima Outpost
Chapter 4 - The Eravana
Chapter 5 - Maz's Castle
Chapter 6 - Battle of Takodana
Chapter 7 - The Resistance
Chapter 8 - Starkiller Sabotage
Chapter 9 - Destroy Starkiller Base
Chapter 10 - The Finale
Epilogue - Luke's Island
After you complete the epilogue level, this achivement should pop this achievement along with