Won a duel against another player

1000 kills.

Kill 25 enemies in a helicopter

Earned level 50

Customize a primary weapon to high aggro

Perform 20 reach over cover takedowns

Kill 25 enemies with a quickdraw from mock surrender

Work with a Buddy to subvert a mission offered by a faction

Complete the Do Not Touch Challenge.

Complete Chapter 10 on any difficulty setting (Story Mode).

Create a combo weapon

Online: unlock 3 weapons in the Engineer kit

Aquire all conflict diamonds in the game available through payment or exploration