Achievement help

i cant do the Achievement that i have to speed up speed 50 times??
in order to do it, i have to link my account to game center or not? (cuz i didnt link but i have already collected some Achievement )
so how i can get this Achievement ??

answer plz....

You don't need to link your account to gamecenter to get the achievements because your account may already be linked. You can do the achievements and you will still be rewarded with achievement points. To check how many points you have just go to local achievement ranking and scroll through the list until you find yourself (May take some time)

Hey! Ditto MILK MAN!!!

but i cant do the Achievement "Efficient Speed-Up"
can someone help me??

but i cant do the Achievement "Efficient Speed-Up"
can someone help me??

You need to speed up upgrading/building troops, buildings, techs and traps and turrets 50 times via the "SpeedUp" button (this costs coins).

Hey! Ditto MILK MAN!!!

What?

thank u very much K2700