Motionsports Adrenaline
44 Achievements
PS3
License To Spill
Nail your opponent with a weapon twice in the same Kite Surf race
21.4%
How to unlock the License To Spill achievement in Motionsports Adrenaline - Definitive Guide
I managed this with a chair. By switching places with the chair I was able to log into each player separately. I still unlocked the achievement while controlling player 2. Simply steer through the weapon icons and fling them at your co-op partner/chair until it pops.
You will need two controllers to earn this trophy. This is a pretty easy trophy. Just run over the weapon symbols with your surfboard and then press to attack your opponent. There are plenty of opportunities to get this trophy on each track.