The Gage Shotgun Pack Add-on for PAYDAY 2 has 12 achievements.
Complete any day of a heist in stealth with a Locomotive 12G shotgun modified with the "Silent Killer Suppressor" equipped. Unlocks the "Suppressed Barrel" for the Street Sweeper shotgun, "Rutger" mask, "Banana Peel" material and "Banana" pattern.