Break 5 Windows
Perform 100 lethal takedowns
Kill someone by shooting an exploding barrel.
Perform a headbutt on perps 100 times
Perform 50 wall jumps
Finish a level without killing a perp
Destroy two explosive barrels with a grenade
Complete the main storyline on Easy difficulty
Complete the main storyline on Normal difficulty
Complete the main storyline on Hard difficulty
Uncover the Arbiter's secret
Complete the Arbiter's Secret storyline
Allow the bomb to explode
Discharge your firearm 1000 times
Incur 100 civilian casualties
Make 100 perps surrender
Allow 100 perps to escape
Perform 100 non-lethal takedowns