У вашего броузера проблема в совместимости с HTML5
I think its about time for a barbeque. Lets see how these critters taste fried up on their own hell-fire. Hhmmm, chicken. Always chicken.
The mobs required for this achievement are called 'Tormented Stingers' and can spawn when you break an Infernal Cocoon or when you approach a Hell Bringer. If they spawn while approaching a Hell Bringer, 5 will spawn together.
To get credit for the achievement, 3 Stingers have to die to the same tick of the fire from the Hell Forge. If 4 or 5 die together, this may upset the Forge and you won't get your achievement. No one likes to waste food.
I resorted to beating them down to 20-30 health, then dragging them into the path of fire. This got me the achievement as each Stinger died to the very first tick of fire.
I hope you have some good luck with spawning these little blighters and can grill them perfectly on your first go.
Good luck and have fun!