LEGO Marvel's Avengers

You need 70,000 studs to achieve True Avenger status in this level. It is possible that this can be obtained without the use of any multipliers, but if you have one or more, turn them on in the Extras menu to make it easier. If you don’t have any, the Studs x2 red brick is located during Free Play in the main game level, ‘Struck Off the List’. That one will be enough to unlock this achievement. Refer to the video below for its location.

Once you have acquired it, enable it and start the level. Play through the level and once you obtain True Avenger status, whether playing Story mode or Free Play, you must complete the level to unlock this achievement. If you are playing Free Play, you cannot Save & Exit the level as it will not count as complete

Thanks to packattack04082 for the video: