We went back and took a look at this and weren't able to find the issue. The monsters in the Vitalizer Control rooms are not set to give credit for those achievements. Looking at the data, you need to kill all three bosses, all of the groups of monsters and the two Curators which appear along the way. We do this by awarding credit when the group of monsters, or the individual monsters in the case of the bosses and curators, dies. The monsters in the Vitalizer Rooms do not have the ability to fire this action on their death as its not attached to them.
To track down the issue could you describe what you did to get the achievement that failed and then what you did that was successful? Perhaps it was a situation of one of the monsters getting stuck which prevented you getting credit for killing that group of monsters.