From Halopedia, the Halo wiki
This article is about the achievement. For the Waypoint Award, see Distinguished Service.
Distinguished Service is an achievement in Halo: Spartan Assault. It is unlocked by earning every single medal in the game at least once. The achievement is worth 15 Gamerscore on Xbox 360 and Windows systems, and 30 Gamerscore on Xbox One. It is represented by three chevrons on a shield in a circle. Players can view their medals from the main menu in the Records section.
List of Medals
If the player has previously unlocked this achievement on one Windows 8 device or Xbox console, it will automatically unlock the first time the player signs into another (Windows or Xbox) version of the game.