All According to Plan...

All Acoording to Plan... is an achievement in Halo: Combat Evolved Anniversary that is awarded for killing all the enemies in the first encounter in the level The Truth and Reconciliation without being detected. It is worth 25 Gamerscore points.

It is represented by an M6D target reticule, with a cross in the middle surrounded by a pink star, which in turn is surrounded by a purple octagon.