From Halopedia, the Halo wiki

This article is about the achievement. For articles of the same name, see Infinity (disambiguation).
10 Gamerscore icon taken from Originally a single block colour (with the two circles both being white and the 'G' a transparent cutout), but modified by myself to display nicely on dark *and* light themes, and to be reminiscent of the pre-Xbox One gamerscore icon.

Infinity is an achievement in Halo 4 and Halo: The Master Chief Collection. It is awarded when the player completes the fourth campaign level, Infinity, on any difficulty. The achievement is worth 10 Gamerscore. It is represented by a shield with a "4" inside it in Halo 4[1] and is represented by an image of the jungle seen in the mission in the Xbox art.