I think the dev and mods should filter out or sort out or lock this kind of post.
I do agree the arena is kinda broken but after u learn the turn n tricks, u will manage it. Hey, im a free player, lvl 71 and have a handful of 5* heroes which i workout to get it, period. This post is really getting out of hand, does the achievement are crazy? NO, its only over a month the game been released and some of u already start whining just over the achievement?
At day 1 of the event i too think the 100 arena wins is over my head even for a high lvl player as me coz i dnt hane the proper equip to do it. But hey, its not even a week im already at 42/100 wins. If u have the will, theres always a way. Dont whine over other peoples effort over your own incompetence.
And all achievement in all games, in any games, there is always this last 1 or 2 goals or more are meant for the real hardcore. Dont expect a mere 2 weeks old player wanting all if not the most tantalizing prize to be getting from an event prize easily. Think again.
Build up your team, build up your skills, know your play style and u will find your way.