This achievement is the longer of the two which requires two players. All you have to do is start up a private co-operative game and make sure you pick the first level (‘Summer in Cairo’) and set auto cycle to ON. To make it easier, set the difficulty to Tourist and put infinite ammo ON. Run through all the levels with your partner and you’ve got it!
NOTE: This does NOT have to be done in one session and the game will keep track of any levels which still need to be completed in the in-game tracker.