Saint's Seven Achievement
Win all seven Ranked Strong Arm Activities, and win on all seven Strong Arm maps
For this achievement, you must win a Strong Arm round of each of the following Activities:
Demo Derby, Hitman, Insurance Fraud, Mayhem, Racing, Snatch, Theft
You must also win a round in each map while playing Strong Arm:
Little Shanghai, North Shore, Nuke Plant, Oldtown, Parthenon, Posiedon's Palace, Wharfside
You don't actually have to do this in a ranked game, so the quickest way is to just start up a Party match, set it to the map/activity you need, and get a friend to lose to you.