The regular achievements are fun, but if Blizzard adds class achievements we got something to help you practice your class skills with!
Tame "x" pet
"3 Birds With One Stone": (PvP)Launch one Freezing Trap into 3 enemies
"That's a sick puppy!": Win a duel with someone close to your level using only "Eyes of the Beast"
(PvP)Kill two enemies with one "Killing Spree"
"No One Can Complain Naow!": (PvP)Use no stuns for a whole pvp battleground with a minimum of "x" kills!
Sap "x" faction leader (I know you can't sap them now but it would be pretty funny)
"They Call Me Houdini": (PvP)Use Shadowstep 3 times in one minute
"Please Count Backwards From 10": (PvP) Kill "x" enemies in a battleground using only anesthetic poison
Enslave "x" demon for "x" amount of time
"Ultimate Faceroll": (PvP)Be number one in a battleground and have NO TALENTS! (Epic Tripped out Goblin Car Reward! or other...)
"Numbers Mean Nothing!": Defeat someone in a duel who is "x" levels or more above you!
Of course Blizzard can come up with better names/achievements, but this would be great to add in! The ones I posted are mostly for novelty purposes, but I would really like ones that teach you how to use your class more effectively or teach you something cool about your class that you never knew before!