Olympic Games: London 2012
45 Achievements
PS3
Competitive Spirit
Complete a multiplayer game, while representing a nation
68.9%
How to unlock the Competitive Spirit achievement in Olympic Games: London 2012 - Definitive Guide
PSGTV
Play any multiplayer game and this will pop up (note this can be done offline). I did this on Team Archery in Event Play mode. Upon completion of the event (regardless of the outcome) the trophy will pop up.