This is best boosted with a full lobby of 12 since getting it legitimately is nearly impossible (if you can do it though...maximum Kudos
).
A Frenzy match consists of ten 60 second rounds. In each round the game will provide you with a new weapon and attachments. The point limit is 10,000. You can however end the match early if you get too many kills and the associated multipliers.
Get
two (!) kills with each weapon and then let the time of that round run down. Do that for all ten rounds. Let someone else kill you once just to keep your points in check. The Trophy unlocks in the game so as soon as you got it you can go for the point limit and end the match which will also net you...
The Flawless Victory trophy in Crysis 3 worth 81 pointsGet the most kills and win by reaching the score limit in a game of Frenzy (Public Match only)