This will not be easy,this will take a lot of practice and patience. Some also Have reported that the achievement did not unlock in game but at the main menu looking at their times for each mission. It can be a mixture of both solo and co-op, (read the EDIT below) it takes the best time from whichever you did it in whether it was in solo or co-op. This must be done on legendary and it can be done in co-op or single player, it depends on your preference really.
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