To add a little insight on this achievement.
Heres some random info-The gears are NOT the Lego turbine things in that (something I previously thought when I was first going for this)
-The correct gears I got this achievement were right after you use Frozone to stop the big turbine and smash through two layers of wall with Mr Incredible
-This is an appropriate time to attempt this achievement because you have a larger number of enemies that spawn BUT they are NOT infinite.
Heres the trick- When you are standing on the playform, there are TWO rotating gears going into the floor. There is also a Y split of piping, this is key. With Mr Incredible Press
to pick up an enemy. Stand on the Y piped part of the platform and face the rotating gears. Press
toward the gears and they should be thrown at the right distance for it to count as 1. Repeat this 5 time's and the achievement is yours.
One last thing to watch out for... Dont let the enemies bunch up, you will do a smash attack and kill like 2 or 3 in a row. Also dont move too much with Mr. Incredible, he kinda tramples everything in his way, thus killing even more by accident. Seriously, he's worse than the Hulk at being dainty lol
-Heres a basic video of me throwing one enemy with the what I described above-