Light three enemies on fire with one continuous Flamethrower attack. (Single-Player)
Complete an "Insanity" single-player game, or 5 "Gold" multiplayer extractions from any firebase.
Successfully complete a combined 25 strike team missions or APEX multiplayer mode extractions.
Kill a foe with a Rank 5 weapon in a single-player game or equip a Rank 10 weapon in multiplayer.
Unlock Rank 6 for each single-player profile type, or obtain a Level 6 multiplayer bonus stat.