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