Monsters vs Aliens

Easy way to get the Flying Fish Achievement. The Location on the video is on Chapter 4, Level 21 (To The Rescue). To do a Leap Attack press & hold the "X" button for a few seconds and highlight your targets. You should get 5 to 10 Aliens for each Leap Attack.

In order to initiate The Missing Links leap attack you need to hold down the "X" button until you see that his hands are glowing and a chime will sound, once they're glowing/hear the chime you can release the "X" button, The Missing Link will now pound on the floor and everything will be in slow motion, the resulting shockwave from him pounding on the floor will result in any enemies nearby being thrown into the air, when this happens some small target markers will be around each floating enemy, use the "LS" to mark the enemies and then The Missing Link will attack all the highlighted enemies with a one-hit-kill attack.

Repeat this manoeuvre a total of 50 times and the achievement will unlock, you shouldn't need to farm for this achievement, just actively try to use it throughout the course of the story.

To perform a Leap Attack, simply press and hold X down until The Missing Link's hand glow a bright white (about 3 seconds) then release when fairly close to an enemy, this should trigger a 'slo-mo' section whereby all the enemies you can hit have a target on them and you have to use the LS to highlight the order of attack. Do this 50 times.

It should happen naturally through the game if you remember about it, I didn't and just hammered it the next time I was playing as the Missing Link, didn't take too long at all.