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Nagato makes moving easy achievement not unlocking

OP Kaiologyy

Did it coop, halo 3 odst legendary in 3 hours. No achievement. Can anyone help?
There were some I couldn't get also... Real buggy. The one where you have to get all 30 intel's. No matter what I did the marine wouldn't follow me down the hole to the second floor so the intel station would be there.