The The Butcher's AK/CAR Mod Pack Add-on for PAYDAY 2 has 8 achievements.
In the Firestarter job, complete the heist on the OVERKILL difficulty or above, with all days done in loud and with a crew of 4 players using unmodified "AK Rifle" rifles and "PARA" submachine guns. Unlocks the "DMR Kit AK.762" and the "Low Drag Magazine" for the AK weapon family, "Timothy" mask, "Prehistoric" material and "Dinosaur Stripes" pattern.