For Top of the World Extreme, it seems as if you need to take down the enemy immediately after knocking them down with the caltrops. I had to restart several times because of it not registering.
Anyways, thanks for taking the time for the videos. It sure helped me.
146/146 games completed (including DLC)
Completion percentage: 100%
Latest retail completion: Kingdoms of Amalur: Reckoning
Latest arcade completion: The Wolf Among Us