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.
163/164 games completed (including DLC)
Completion percentage: 100%
Latest retail completion: Dragon Age II
Latest arcade completion: Dust: An Elysian Tail
Currently Ranked #1 on Achievement Completion Percentage Leaderboard on TA