Kill 10 enemies with throwing knives.
Shoot an enemy through a wall.
Kill 15 enemy using concentration mode.
Kill 2 enemy with one shot.
Kill 10 birds.
Shoot 5 cable lines using sniper rifles.
Complete Act 1.
Finish the game on Hard difficulty.
Complete Act 4.
Kill a total of 30 enemies with Browning gun.
Collect all secrets.
Complete Act 2.
Kill all enemies attacking your pontoon from the riverside on 'Weaken The Regime' level.
Finish the game on Normal difficulty.
Deliver 100 headshots.
Finish the game on Easy difficulty.
Kill 2 enemy with one grenade.
Complete Act 3.
Deliver 50 headshots.