Yes! whoever submits himself entirely to Allah and he is the doer of good (to others) he has his reward from his Lord, and there is no fear for him nor shall he grieve.
ليس الأمر كما زعموا أنَّ الجنة تختص بطائفة دون غيرها، وإنما يدخل الجنَّة مَن أخلص لله وحده لا شريك له، وهو متبع للرسول محمد صلى الله عليه وسلم في كل أقواله وأعماله. فمن فعل ذلك فله ثواب عمله عند ربه في الآخرة، وهو دخول الجنة، وهم لا يخافون فيما يستقبلونه من أمر الآخرة، ولا هم يحزنون على ما فاتهم من حظوظ الدنيا.
The matter is not as they have thought (i.e. the Christians and the Jews) that Paradise is specific to only one group.
Only those who are sincere to Allaah alone without setting up any partners with Him and follow the Messenger, Muhammad (sallallaahu alayhi wa sallam) in all of what he says and does will enter Paradise.
He who does the above will have the reward of his deeds in front of his Lord in the next world. He will enter Paradise.
They will not fear what they have to face of the affair of the next world. And they are the ones who are not sad for what they failed to achieve in this worldly life.