Minor Location spoilers!
Once you reach the boat location you will find remote bombs scattered across the area.
To unlock this achievement you have to allow the moulded enemies to hit you until one of them trigger the "grapple" animation, during that you will have the opportunity to stick a remote bomb to the enemy, after this simply press X to detonate and the achievement will pop.
There is no definite way of triggering the grapple animation and you will have to simply continue to be hit by the enemy until it works.
EDIT: It seems that the animation is more difficult to trigger on easy but definitely still doable