Birth of a Spartan
From Halopedia, the Halo wiki
Birth of a Spartan is an achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection. It is awarded for completing the campaign on Normal. It is worth 10 Gamerscore. If a player completes the campaign on the Heroic or Legendary difficulty without this achievement already earned, they will be unlocked together.
In the original game it is represented by the difficulty shield with an MA5B Assault Rifle over it, however the The Master Chief Collection Steam achievement icon depicts the well-known single sword instead. The Xbox art is concept art of a structure on the surface of Installation 04.
The name of the achievement is a reference to the Halo: Reach viral campaign Birth of a Spartan.