Beware of BlazBlue's Broken Achievements
Thus far, Aksys has released two DLC characters for BlazBlue: Continuum Shift: Makoto Nanaya and Valkenhayn R. Hellsing. Both come with three new achievements, but unfortunately for players who purchased the latter character, they'll have to wait for a patch that may never come to claim those extra 85 gamerscore.
If you do purchase Valkenhayn R. Hellsing and complete the achievement requirements, you will likely be forced to recover your gamertag when the game gets patched. GameZone reached out to Aksys to see if said patch is even in the works and got the following response (translated from Arc System Works):
"There have been issues where additional achievements can't be unlocked for the character, Valkenhayn R. Hellsing which was recently released on the 7th. We're currently looking into those issues. We apologize for any inconvenience this may cause."