Breaking Quarantine (achievement)

Breaking Quarantine is an achievement in Halo: Combat Evolved Anniversary that is awarded for escaping the Flood containment facility on the level 343 Guilty Spark in at most 21 minutes. It is worth 25 Gamerscore points.

It is represented by a white outline of an analog clock with the number "21" beside it on top of a green octagon.

Trivia

 * The name of the achievement is a reference to the story Breaking Quarantine in the Halo Graphic Novel.
 * The requirement that player needs to escape the facility in 21 minutes is most likely a reference to Bungie's obsession with the number 7, as 21÷3=7.