Customize a primary weapon to high aggro

Complete the game on the hardest difficulty

Make only positive choices

Tie up 15 enemy combatants instead of executing them

Listen to all of the radio broadcasts

Kill 400 enemies with assault rifles, submachine guns or shotguns

Heal your partner 10 times

Allow your partner to snipe 5 guys while in mock surrender

Kill 100 enemies with a sniper rifle

Shoot 2 enemies in the head with a single bullet

Complete half the game on hardest difficulty

Complete Chapter 2 on any difficulty level

Kill 3 or more enemies with a single grenade