There's not really much to read, as they currently have no use apart from comparing them with others.
Wiki: Quote:
An achievement point is a unit that accumulates based on different types achievements. However, there are currently no plans to allow spending them on anything.
Some achievements have very nice rewards however (mounts, tabards, titles etc.)apart from the (pointless) achievement points.
Edited, Nov 25th 2008 10:18pm by nightmareke