From Halopedia, the Halo wiki
117 is an achievement in Halo: Spartan Assault. It is unlocked by earning all gold stars in all operation missions. The achievement is worth 20 Gamerscore on Windows systems, 30 Gamerscore on Xbox 360, and 60 Gamerscore on Xbox One. It is represented by a circle with a star and the number 117.
On Windows devices on which Spartan Assault was first released the 117 achievement is awarded for earning gold stars on all missions in Operations A through E and is worth 20 Gamerscore. A title update added Operation F on August 29, 2013; earning gold stars in all of these missions awards the Tour of Duty achievement, worth 10 Gamerscore.
The Xbox One and Xbox 360 versions of Spartan Assault - released December 23, 2013 and January 31, 2014, respectively - do not include the Tour of Duty achievement. Instead, earning gold stars in all Operation F missions is required to unlock 117. The Gamerscore from Tour of Duty is added to 117, bringing the totals to 30 and 60 Gamerscore on Xbox 360 and Xbox One respectively.
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 (Xbox or Windows) version of the game.