Ok so you HAVE TO kill the persians by using the Efreet (the big firey ground-pound thing)
on all of the soldiers. if ANY die not by the efreet you die. also the cyclops will kill
them too and you still die if he kills them so you gatta kill him first. Hope this helps!
GOOD LUCK!

if u were in one time ur dead 1st stage use the efret to kill the persian soldiers press
R triangle to use it press also O while using it. 2nd stage kill 20 fire guards w/o being
hit. U can use any attack and u can kill by 3 hits .Oh dont forget ur gonna be killed in
one hit in all the levels so be fast in dodging their attacks i think u can also unlock
costumes in each stage

I completed the challenge, upto level 3.....but I can't beat level 3