Ok, major tip for this achievement and it may be obvious to some. But I was having the hardest time trying to get this thing. I took the advice above and studied the video linked below (courtesy of Achievaholics). I must have made over 100 attempts but for the life of me the rhino always seemed to be farther away from me after that last jump than what can be seen in the video.
Solution - Do it on Easy. I was doing my Hard playthrough originally. If you play on Easy, the rhino will run just a smidge slower than he does on hard. You should be able to nab him right after that last jump and between the first and second speed boosts on the ground. I got it on my first attempt that way.