Originally Posted by Darth Villainous
Huh. I confess I got this achievement naturally, and thus just assumed it was the same as all the others. I'll add a note to the guide that it may not work this way.
I can tell you now that either the small tame monkeys don't count or the kill reload doesn't work for the achievement. Used the 3 monkeys by the one treasure chest early in the game which would've been quick to get it and it never popped.