Heavyweight and 30 Mill $ Weapon Achievements
Not sure if anyone has said this already but the quickest way to get these 2 is on the second level Shipyard Infiltration, when you are ambushed with a smoke grenade 5 guys come at you. Take the first 2 out with your fists to build up 3 bars and add to the Heavyweight achievement. Then use the multi-takedown to add 3 to the 30 Million Weapon achievement and reload the last checkpoint which was at the door to the warehouse. Found it to be quicker than using the Escape the Embassy level.