Possess the sleeping Slig (R1 + R2) and go near the Mudokon. Press down on the D-Pad to make him cower. Shoot over his head and the Trophy is yours.

Here is the full list of all 45 Oddworld: Munch's Oddysee HD trophies - there are 30 bronze, 11 silver, 3 gold and 1 platinum.