For this achievement you need to get 10 medals based on Special Equipment (
)
Some examples are:
Kill 2 or more enemies rapidly while Golden Ammo is active (Crash)
Kill 2 or more enemies rapidly in the radius of the Sensor Dart (Recon)
Kill 2 or more enemies rapidly with a Cluster Semtex (Battery)
Kill 2 or more enemies rapidly with Reactor Core (Firebreak)
Kill 2 or more enemies rapidly after using the Grapple Gun (Ruin)
Kill 2 or more enemies rapidly after stun them with 9 Bang (Ajax)
Get a headshot on an enemy stunned by your Seeker Drone (Prophet)
It is not necessary that you obtain 10 times the same medal, they can be different.
The Specialists released after launch (Zero, Outrider, Spectre, Reaper) don't count towards the achievementYou can watch your progress pressing Start in multiplayer lobby -> Medals -> Specialists.