Legend of the Guardians: The Owls of Ga'hoole
51 Achievements
14-18h
PS3
No Witnesses
Defeat every enemy in a story mission
60.4%
How to unlock the No Witnesses achievement in Legend of the Guardians: The Owls of Ga'hoole - Definitive Guide
Cauchy
This will come naturally, since some story missions require that you defeat all the enemies.