The Gage Russian Weapon Pack Add-on for PAYDAY 2 has 4 achievements.
Complete any heist using only weapons from the Gage Russian Weapon Pack on the OVERKILL difficulty or above. Unlocks the "Red Machine" mask, "Tricolor" material and "Russian Gamble" pattern.
Kill 32 enemies without reloading with the Tatonka Submachine Gun. Unlocks the "War Balaclava" mask, "Russian Camouflage" material and "Red Star" pattern.
Kill 300 enemies using any weapons from the Gage Russian Weapon Pack. Unlocks the "Kokoshnik" mask, "Propaganda Palette" material and "Bear Fight" pattern.
Complete any heist in stealth using only weapons from the Gage Russian Weapon Pack. Unlocks the "Matryoshka" mask, "Ceramics Gzhel" material and "Prison Statement" pattern.