Crash Of The Titans

What this means is that, while you are relatively far away, yet close enough to hear the conversation, you listen to a couple of bad guys talk to each other. This can be done on the first level. You will come up to two guys talking to each other at a waterfall. Simply stand away, put your controller down, and listen through their entire speech. The "listen to 5 creature conversations" can have the same speech used multiple times, so go ahead and abuse it while you replay this level while going for extra lives/creature leveling up. If you're wondering what I'm talking about, check out what I said under the "get 9 lives" and "get 15 lives" achievements.
It will unlock after you hear the 5th conversation in full.

When your playing the game you will come apon creatures talking to each other, the music will become low and you'll be able to hear them have conversations, just sit back and listen and wait for the music to come back up to volume and you know you will have registered 1 eavesdrop, be careful not to get to close or they will spot you.

if you load up level 5 you instantly listen in on a conversation once there done talking save and quit and redo that 4 more times, You can also find enemy’s talking in the 1st level at the waterfall