Originally Posted by DerekThePhenom
which ever update it is that finally adds the create and adventure modes
For future reference. Just ask any questions about updates in this thread.
In about 2 weeks we will be getting the update with creative mode and lots of other features. (Again go to the link to see what those features are).
As for Adventure mode. Minecraft 360 Edition has only been confirmed to be updated to the 1.2.3 version which is before the addition of Adventure mode.
It is currently unknown if it will be updated to that point. Before you ask, we have no idea when the 1.2.3 update is coming. We won't know for a long time.
As for the question about achievements. They haven't said anything so far about adding achievements.