Once Bitten, Twice Shy (25 player)

Once Bitten, Twice Shy (25 player) is a dungeon & raids achievement earned for defeating the Blood Queen once as a vampire and again without becoming a vampire on 25-player mode.

Strategy
Not a particularly daunting achievement, but it can be something of a pain to get. DPS will have an easier time defeating her while becoming a vampire and healers and tanks will have an easier time defeating her without becoming one. It requires either to have duel specs (one tank/healer and one DPS) or some communication with your raid leader requesting that you be bit or not be bit. Other than that, there is no specific strategy or quirk to the tactics of the fight to get it.