No Credit for Criteria for Achievement - Glory of the Icecrown Raider

The Glory of the Icecrown Raider achievement has two separate difficulty levels. It can be completed on either 10 player difficulty or 25 player difficulty. The criteria completion for either achievement will only show up on the achievement difficulty that you completed the raid on. If you are not seeing  your criteria completed on the difficulty you're looking at, check the other difficulty.

Unlike other meta achievements for raids, Glory of the Icecrown Raider does not credit individual boss achievements. Instead, it tracks your kills of individual Heroic level bosses and gives you the credit for the wing that you have completed. Individual boss kills will not award you with individual achievements.