Step achievement not updating

[triplumix]

AirGooglePlayGames.getInstance().reportAchievement("CgkIlZ-a5_oYeAIQBA", 8);

It works without the step parameter.

I use above line, but nothing happens, why ?

[hajnyj]

The second parameter have to be between 0 and 1.0 (Number as percentage, but I dont know if it adds or sets this Number)!! and it only works if you have in GP Dev console in Game Services->Your Game->Particular_Achievement checked "incremental achiev"..otherwise you should use it without second parameter (same as 0 as sec parameter)