This is an easily missable achievement
As you get to the doorway giant. pick up a car and throw it at the helicopter thats flies over him.
You may have to push R3 to bring up the manual lock on/throw option. As the first place didnt always seem always work/achievement but did work for a friend.
As noted - demon form does not give you the option of picking up things, so if you want the achievement, don't transform.
note : Batman also linked this video in the comment to help out