Welcome, fellow Liches.
Cruel minions and machinations have prevented all achievements from being accessible. Also, greedy goblins have set the Bargainer Of Souls achievement to the wrong number - it is 100.000 souls you need to satisfy that hunger, not only 10.000 souls a mere budding necromancer would be happy with.
Also, the Big Hunger will now trigger correctly in all instances - as soon as three souls are harvested at the same time, no matter whether you time your soul cleansers correctly or use an otherwordly power, you will unlock that achievement.
Also, you can no longer reset your achievements. Because who would want this, right?