Achievements (Halo: Spartan Assault)
From Halopedia, the Halo wiki
There are a total of 32 different achievements in Halo: Spartan Assault which are found on five different platforms. No single version includes every achievement.
The game was originally released for Windows 8 and Windows Phone 8 devices on July 18, 2013 with a total 20 achievements worth 200 Gamerscore on each. Five additional achievements worth 50 Gamerscore were added with a Title Update in August 29, 2013, bringing the total to 25 achievements worth 250 Gamerscore. Two of the achievements, Tour of Duty and A for Effort, are found only on Windows.
The Xbox One version of the game was released December 23, 2013, with 30 achievements worth 1000 Gamerscore. Seven new achievements are featured, two of which are only on Xbox One. Gamerscore values are double those found on the other platforms.
The Xbox 360 version was released January 31, 2014, with 28 achievements worth 400 Gamerscore. It features all the same achievements that are found on the Xbox One version, save for the two exclusives, The Enemy of my Friend and Immune.
Spartan Assault was released on Steam on April 4, 2014, and on iPhone and iPad on April 16, 2015. The Steam and iPhone/iPad versions of the game feature the same achievements as the Windows version, however they utilize different profiles, and therefore do not award Gamerscore.
Players with the proper hardware can purchase Spartan Assault for each of the four Microsoft platforms, and potentially unlock most of the achievements as many as 4 times. Playing on all four platforms will allow the player to unlock a total of 108 achievements worth 1900 Gamerscore.