Serious Sam 4
54 Achievements
15-20h
GOG
Spread the Joy
Kill 3 enemies with a double shotgun blast.
44.4%
How to unlock the Spread the Joy achievement in Serious Sam 4 - Definitive Guide
Really easy to get as the first level where you get this weapon has a ton of weak enemies that you can easily bunch up together to clear out with one blast, though i'd recommend doing this on tourist difficulty so you have enough time to line up the shot.