Oddworld: Stranger's Wrath HD

Missable!
As you make your way through the Wolvark facility on your way to the boat, stop when you reach the second bridge that you need to cross. Instead of crossing, jump to the left into the water and swim towards the general direction you came from. You will see a rope to your right, as well as a platform with a door switch and a large sewer pipe with a metal grate covering the entrance. Deal with the Wolvark near the switch, press it and head through the sewer pipe. The trophy will pop by the time you have entered the corridors.

See the spoiler below for a video walkthrough. This video shows you going across the bridge instead of jumping off and turning left to go towards the switch at the bottom of the ramp, but this will involve fighting more Wolvarks. Be warned, this video may contain spoilers. Credit to kamijordan.