For this achievement you need to get 10 pilot kills while in a Titan. I recommend using a Stryder equipped with a Chaingun so you can locate and kill pilots quickly.
This achievement will be significantly easier if you wait for longer games such as Attrition or Hardpoint Domination to pop up, rather than shorter games such as Pilot Hunter, CTF, or Marked for Death.
I recommend putting on multiple burn cards that give you immediate titans.
This achievement must be done on the map Zone 18, which can be frequently found in the IMC Rising playlists.
P.S. Those who are saying attrition is short, I had 16 kills in the titan before either team reached 200 points, then unfortunately had to go eat. (It was looking to be one of my best games