Here is the full list of all 14 Aery - there are Heaven & Hell achievements worth 1,000 gamerscore.
Finish Act I
Finish Act II
Finish Act III
Finish Act IV
Finish Act V
Finish Act VI
Finish Act VII
Finish Act VIII
Finish Act IX
Finish Act X
Finish Act XI
Finish Act XII
Finish Act XIII
Finish Act XIV