DOOM + DOOM II

In Doom II, go to Map 23 - Barrels O' Fun (do it via Level Select). Set the difficulty to something low like Hurt Me Plenty where you can guarantee a good amount of enemies. Get through the first room with the Mancubus, run past the Hell Knights, and shoot the barrels near the Chaingunners which are just after them. You'll get the achievement.

For now (2024-08-08) you can still use cheat codes to unlock achievements. IDDQD for God Mode, IDKFA for all weapons.

For those who voted negatively, let me know what I can do to improve this solution.

Doom E1M8:Phobos Anomaly, any difficulty. Just shoot a single barrel with pistol.