Extra Credit
From Halopedia, the Halo wiki
Extra Credit is an achievement in Halo: Spartan Assault. It is unlocked by completing 75 mission specific challenges. The achievement is worth 10 Gamerpoints on Xbox 360 and Windows systems, and 20 Gamerpoints on Xbox One. It is represented by a circle with an arrow pointing to the right.[1]
At launch, Spartan Assault featured three mission specific challenges for each of the game's 25 missions. In order to unlock the achievement, players had to complete every single challenge. With the release of the Operation F: Hydra update, fifteen more challenges were added, bringing the total to 90. Completing the 15 mission specific challenges in Operation F will unlock the A for Effort achievement, and allow the player to forgo 15 of the more difficult original challenges.
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