Crystalline Conflict is a very fun game mode but I feel it would be even more fun to work toward some interesting achievements other than just "Win 1000 games as a melee" I wanted to give some feedback that could be used for achievements, and perhaps you could come up with some interesting titles associated with them.

I think achievements like these would be more interesting;

Win 100 games of Crystalline Conflict while 1 or more of your teammates is dead

Win 100 games of Crystalline Conflict in less than 1 minute

Win 100 games of Crystalline Conflict while your team composition is only DPS

Collect 5 bomb power ups and get 5 Killing blows before your buff expires

Collect the chocobo feather 100 times in the wind map

Spend 4 minutes or longer in the crystal 50 times

Collect 300 potions on the ground

Kill 100 enemy players while running on the speed tracks