Whenever faith is mentioned, the righteous deed is mentioned as well.
جَنَّاتٌ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ (gardens beneath which rivers flow): This is the description of the heavens they are promised with.
ذَٰلِكَ الْفَوْزُ الْكَبِيرُ (That is the great attainment): The attainment means victory and overcome to those who have believed and done righteous deeds. Allah (swt) says:
{فَمَن زُحْزِحَ عَنِ النَّارِ وَأُدْخِلَ الْجَنَّةَ فَقَدْ فَازَ }
(And whoever is moved away from the Fire and admitted to Paradise, he indeed is successful.) (Ali-Imran: 185)
There is a success and a great success while the supreme success is the good pleasure of Allah (swt).