Help with ashes to ashes and bullet sponge

I have a problem with 2 multiplayer achievements ashes to ashes and bullet sponge.For ashes to ashes I have gotten way more disintegration kills needed for the achievement and I have done them on the castle maps.For bullet sponge I got two close call medals on landfall and I thought I would get the achievement after the match has ended but it didn’t unlock.Also I have notice several other players who can’t unlock ashes to ashes even after 6 disintegration kills .I hope 343 industries fixes this problem in the next patch for halo 4 any help and info on this problem would be appreciated.

Are you making sure to do them on the appropriate DLC maps? Ashes to Ashes can only be done on Castle maps: Daybreak, Outcast, and Perdition. Bullet Sponge can only be done on Majestic maps: Landfall, Monolith, and Skyline.

Some of the Forerunner weapons (Scattershot for example) don’t always disintegrate players. An easy way to get Bullet Sponge is to get your enemy’s shields down and then throw a Pulse Grenade at their feet. The initial explosion will kill and disintegrate them.

Yes I have tried both achievements on the proper maps and I used the binary rifle and incinerator for ashes to ashes