Originally Posted by Dead Like Me
Give Him the Stick 20
Took out both Hunters using only the Sticky Detonator in mission 7.
Campaign Mission 7 'Composer' specific. Can be obtained on Easy+.
Use 'Mission Select' after initial Campaign playthrough if missed
The Sticky Detonator is acquired in the far left corner in the room with the two Hunters wrecking havoc. It is a charged shot weapon. Press
to fire a sticky onto a Hunter. The sticky will only explode when you press
a second time. The trick is to get both the Hunter's health down, so that one sticky will kill them both while they are near one another.
From the way this reads, it implies you need to kill both Hunters with the same Sticky Detonator round. I can confirm you can kill the Hunters separately with the Sticky Detonator and still unlock the achievement.