Upgrade any weapon to maximum level

Complete the first boss mission

Eliminate 60 enemies

Complete 15 campaign missions

Perform 100 weapon upgrades

Unlock Chapter 3

Land 100 headshots

Complete 30 boss missions

Purchase a weapon using gold

Detonate explosives 50 times

Unlock a Tier 10 weapon

Place first in a Headshot Mania event

Complete a mission with less than 25% health remaining

Complete Chapter 15

Own 30 different sniper rifles