I have received feedback on my Demolition Master support case. Here is their response.
"Unfortunately we here at Activision Customer Support are unable to push any achievements or trophies to your accounts. You will need to retry the challenge again."
Thanks for the answer, unfortunately they do not tell me how to retry them. I have been playing demolition and the challenges on Elite never update.
I am in the same boat jgr51291. And I sent them pictures of the in game challenge screen and the leaderboards showing I have 100+ plants and defuses. Its bad when they can't trust their own system or fix it. And with 47 hours of demolition played I am sure I have killed a bomb planter more than 1 time.