The McShay Weapon Pack 2 Title update for PAYDAY 2 has 3 achievements.
Kill 1000 enemies with either version of the VD-12. Unlocks the "Stateside Conversion Kit".
Kill 500 enemies with the Hailstorm Mk 5's Volley Shot mode. Unlocks the "Prototype Conversion Kit".
Kill 100 enemies with the Viper Grenade throwable on Overkill difficulty or above. Unlocks the "Tombstone Slug" for shotguns.