API:
http://us.battle.net/api/wow/character/sargeras/Lethoian

{"lastModified":1331340206000,"name":"Lethoian","realm":"Sargeras","class":3,"race":3,"gender":0,"level":85,"achievementPoints":14695,"thumbnail":"sargeras/63/85306943-avatar.jpg"}

Compare to:
http://us.battle.net/wow/en/character/sargeras/Lethoian/

There's a 10 point difference from armory/live to the API.
This has been the case for the past month, ever since i completed both 10 and 25m versions of the same achievement back on 2/02/2012

The achieve is [The Traitor King]
http://www.wowhead.com/achievement=3800
http://www.wowhead.com/achievement=3816

Even after in game ticket and about a dozen other achievements since then, still off :(