I was running an alt through A Tearable Fear, and was surprised the alt didn't get the "Make it Quick" achievement, which is for killing Cyndreela in less than 75 seconds. Turns out, the main's Storm Strike twincast, and both critted, so she went down in 1 second (per GamParse). So, one vote for changing the name to "Make it quick (but not too quick!)"
Yup, unfortunately, I found this out with a group - attacked her, hit her with a crit Harm Touch, no update for me or the rest of the group. "Sorry guys, itchy trigger finger."