Each weapon has three upgrade-able stats which require you to meet different usage requirements while using that weapon
to unlock. Descriptions of each requirement - and your current progress toward meeting them - are found when viewing a weapon in the Loadout menu.
Only after you have completed all three
of a weapon's upgrades will you be able to start making progress toward the fourth "Mastery" slot, which unlocks a special gold-themed skin for the weapon.
Once you have completed the mastery requirements for one weapon in each slot - rifle, secondary, and pistol - the achievement will unlock. You do not have to have all three equipped at the same time.
Just choose the loadout that works best for you, or that you've already made the most progress toward, and get to work!Tips:
Mode (on Cadet
, in the Dockyard
Shoulder-Aim Kills (rifles):
Shot Trap Kills:
Kills from a certain distance:
Heart Rate Kills: