Mode: Get to the Chopper
Map: Any
Class: Any Human
This can easily be obtained by yourself.
From the Main Menu, click on Multiplayer, and then Host Game. Set up the game using the following settings:
Game Type: Get to the Chopper
Map: Any
Player Limit: 1
Max Spectators: 0
Play Over LAN: No (very important, if set to "Yes" it disables achievements)
Server Name, Admin Password, and Game Password can all be left blank/default.
Click Start Server. Once in the game be sure to pick the Human team and any of the Human classes. Now you can just run to each objective (displayed on your HUD) and capture each of them (by standing near them).
After you have captured all of the objectives run to the helicopter at the end of the map. This will be the final capture, the game will end and the achievement will unlock.