The The OVERKILL Pack Add-on for PAYDAY 2 has 10 achievements.
Kill 120 or more enemies in any day in a heist, with you and your four man crew having at least 120% crew accuracy at the end of the heist.
Complete the Rats job with you and your four man crew having Combined Tactical Vests, Vulcan Miniguns, HRL-7 Rocket Launchers and "General OVERKILL" masks equipped on the OVERKILL difficulty or above.
In the Breaking Ballot heist of the Election Day job, complete the heist with you and your four man crew without letting anyone getting downed, cloaked or cuffed on the Death Wish difficulty or above.
Complete the Big Oil job, with at least one other player, all using suits and Akimbo Bernetti 9 Pistols on the OVERKILL difficulty or above.
In the Big Oil job, complete day 1 in stealth on the OVERKILL difficulty or above.
Fire the Vulcan Minigun for 25 seconds without reloading or letting go of the trigger.
Complete the Watchdogs job with each crew member using no skills, wielding the AMCAR Rifle and Chimano 88 Pistol on the OVERKILL difficulty or above.
In the Shadow Raid job, complete the heist in stealth while having the Vulcan Minigun and HRL-7 Rocket Launcher equipped.
On day 1 of the Firestarter job, complete heist having burned all weapons on the Death Wish difficulty or above.
On any day of a heist, have four law enforcers converted at the same time on the OVERKILL difficulty or above.