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