Operation Flashpoint: Red River

This is best done on the map ‘The High Ground’ while playing Last Stand (as tanks only appear in this mode). C4 is only available while playing as the Grenadier so make sure it is in your loadout (class setup) before you start playing.

During Stage 4, heavy armored vehicles start to appear in greater numbers in the form of APCs and tanks. They come from both the valley and along the back road (where your extraction marker is). The best way to get this achievement is to lay down C4 along that back road and wait for a tank to roll up (press until the C4 appears and press to throw it down). You can only lay down one C4 explosive at a time. Then, secure yourself in the elevated structure in the Main Area and keep watching that road for a tank. When one shows up, press to select your detonator and when the tank rolls over your C4, press to blow it up.

You can attempt this on ‘Hold the Line’ as well as tanks show up earlier (during Stage 3), but since that map is more open, it might be difficult to find one spot to hole up and wait for a tank.