The The Butcher's BBQ Pack Add-on for PAYDAY 2: Crimewave Edition has 4 achievements worth 90 gamerscore.
Have 10 enemies burning simultaneously.
Set a Bulldozer on fire for at least 10 seconds.
Kill 10 enemies within 10 seconds using the Piglet Grenade Launcher without using Incendiary rounds.
Set an enemy on fire and kill him with the "Motherforker" melee weapon.