Take the tour ×  I've just completed Act 1 - and looking at the
achievements, it seems there are several which have not awarded
because the requisites have been marked as not completed.  For
example: The Last of the Horadrim Achievement which says
complete all quests in Act 1, has few quests marked as
incomplete even though I I'm pretty sure I've completed them.
Why is this so?  achievement list  share|improve this question
add comment  1 Answer  up vote 3 down vote accepted  The
servers, overburdened as they were, had a hard time
synchronizing all achievements the first few days after release.
Official Blizzard response  I had the same issue, and actually
had to redo some bosses in Act I to get the "kill boss X"
achievement.  share|improve this answer I have the achievements
for lvl 10, 30, and 40. But I missed the one for lvl 20. – 
Sjoerd May 19 '12 at 10:49 thanks for adding the link to
Blizzard's reply! –  Sathya May 22 '12 at 7:54 add comment  Your
Answer