Deadliest Warrior: The Game
15 Achievements
9-11h
Pin Cushion
Stick 4 projectiles in a single opponent as the primary player.
64.1%
How to unlock the Pin Cushion achievement in Deadliest Warrior: The Game - Definitive Guide
However, I'd like to point out that you only need to stick in the opponent, you don't have to stick in their meaty parts. That is to say, a spartan blocking your projectiles is just fine, they'll stick to his shield and the achievement will pop.
This is a very, very simple trophy. There are 2 incredibly easy ways to do this:
1) Start a local match against another controller and just leave him sitting there. (Preferably as an Apache, due to its lack of armor.) Choose the Samurai for yourself. As soon as the battle starts, walk over to the Apache and press . This will make the Samurai shoot an arrow from his Yumi bow and the odds are, this arrow will stick into the enemy. You have 5 arrows, stick 4 of them into the enemy and this trophy will unlock.
2) Start a local match against another controller just like in the previous strategy (against the Apache again) but this time, choose the Apache for yourself. He has a bow as well so pressing will fire an arrow into your enemy. Stick 4 arrows in the enemy and this trophy is yours.
You may very well get this just by playing through single player but if you don't, then it can quickly be gotten in local play.