good luck- saubhagya it is the case when we say that it is 'our/your goodluck' more precisely if we talk abt someone's luck which is good hamaara/aapka SAUBHAGYA

congratulation-badhai congratulations- badhaiyaan heartiest congratulations- haardik badhaiyaan to congratulate- badhai dena for 'good luck' or 'all the best' we say 'shubhkaamnaayein' ex. All the best for ur success aapki saphalta ke liye shubhkaamnayein i would like to say that even if u say god bless u, everyone will understand god bless u it doesnt have an exact hindi translation but this can be said- bhagwaan aapko ashish dein bhagwaan aap par kripa banaye rakhen