Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Dies Irae	Promoted to General of the Air Force.
Fortiter Fideliter Feliciter	Promoted to Major General.
Inter Caecos Regnat Strabo	Promoted to Captain.
Lex Talionis	Promoted to Sergeant.
Melius Frangi Quam Flecti	Promoted to Major.
Nascentes Morimur	Promoted to Airman.
Repetitio Est Mater Memoriae	Promoted to First Lieutenant.
Salva Veritate	Promoted to Lieutenant.
Sine Mora	Destroy everything in the Prologue and remain unharmed.
Stercus Accidit	Fail the Prologue.
Suaviter In Modo	Promoted to Colonel.
Tempus Neminem Manet	Promoted to Master Sergeant.