Dedicated to Crimson

Dedicated to Crimson is an achievement in Halo 4. It is awarded for completing the first five episodes of Spartan Ops on any difficulty. The achievement is worth 80 Gamerpoints. It is represented by the Spartan seal with a circle above it that reads "EP 5".

Trivia
The achievement may be a reference to Fireteam Crimson who actually participate in several of the missions for Spartan Ops.