Yes there is one for callin in 25 moabs, if u dnt get it then it might be becuz u prestiged and te challenges reset, like i got 8 moabs on 0 prestige level 80, then i prestigeed and got 25 moabs (33) total and then got my challenge. so far i have 54 moabs, need 6 more the the mother of all bombs VI challenge ( i think thts what its called)

challenges:

call in 2 moabs
call in 5 moabs
call in 25 moabs
callin 40 moabs
and callin 60 moabs.

thats all and u dnt get any titles or emblems, its quite easy to lose track of how many u've gotten but im sure ive gotten 54