The The Butcher's AK/CAR Mod Pack Add-on for PAYDAY 2 has 8 achievements.
In the Nightclub job, complete the heist on any difficulty with each crew member using the OVE 9000 saw as primary and secondary weapons. Unlocks the "THRUST Upper Receiver", "THRUST Lower Receiver" and "Long Ergo Foregrip" for the CAR weapon family.