That Just Happened

That Just Happened is a campaign achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection. This achievement is awarded when a player completes the level “The Library” on Heroic difficulty or higher without dying.halo.xbox.com - Halo: Combat Evolved Anniversary Achievements
==Gallery==
HTMCC AchievementArt ThatJustHappened.png|The Achievement art
==Sources==
Category:Halo: Combat Evolved Anniversary Achievements
Category:Halo: The Master Chief Collection Achievements