Terminals messed up

Ok. So I went through and collected all of the terminals in the campaign with a friend. the achievement popped but it didn’t add 50 to my gs. Also when I am looking at my individual games’ achievements, CE has 950/1000 but when I click on it there are no locked achievements. I contacted support and they said it was an issue on the developer end. I don’t feel like that is the case; I think the people I am coming into contact with are just saying it to pass me on to someone else. If anyone has experienced something like this let me know. Any information that I don’t have on the issue would be great.

Recover your gamertag and re-unlock the achievement.

At least this was the solution to the same problem I had in fallout 3.