A Monument to All Your Sins
A Monument to All Your Sins is a Campaign Achievement in Halo: Reach. This achievement is awarded when a player completes every campaign mission in Halo: Reach on Legendary solo. It is represented by a Legendary symbol with a human skull rather than the traditional Sangheili skull.
- The achievement's name is derived from a quote from the Gravemind: "I? I am a monument to all your sins."  This line is also said by Cortana while under the influence of the Gravemind.
- Completing the Campaign on Legendary will also award the "Gods Must Be Strong" Achievement, which does allow for co-operative play.
- ^ Bungie.net: Bungie Weekly Update 07.09.10
- ^ Halo 2, campaign level Gravemind
- ^ Halo 3, campaign level Cortana