It`s posssible to change the achartengine orientation horizontal to vertical.
No, the current achart library doesn't have this feature.
EDIT:
The only alignment feature present in achart engine is setMargins which can be used to increase/decrease the graph margins.
// Setting margin width,height for the graph
// {top , left , bottom, right}
renderer.setMargins(new int[]{ 80, 60, 20, 20 });