If you are unsure how to get this new achievement (since the description is vague and it's hidden from view if you haven't gotten it already), here's what you must accomplish:

You must clear Hell, both light and dark world
The sum of your best times in Hell must be less than some threshold (this threshold is unknown)

T_____T

Scheint irgendwas mit unter 500 Sekunden für beide Welten zu sein. Heck, ich hab schon in der Light World irgendwas mit so 250. D:
Dark World versuche ich gerade...