‘Ubaadah ibn As-Saamit, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “Allah will admit into Paradise regardless of his deeds, any one who says, ‘I bear witness that there is none worthy of worship except Allah alone without a partner, and that Muhammad is His Slave and Messenger, and that ‘Eesaa is His Slave and Messenger and His Word which He bestowed to Maryam and a Spirit; and that Paradise is true, and Hell Fire is true.’” [Al-Bukhari and Muslim].
Some other means of becoming worthy of Paradise are:


* Memorising the beautiful names of Allah The Almighty.
Abu Hurayrah, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “Allah has 99 names, he who memorises them will enter Paradise.” [Al-Bukhari and Muslim]. Memorising here means to memorise, believe and act according to them.
* Reciting the verse of Al-Kursi (the throne) after each obligatory prayer.
Abu Umaamah, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “There is nothing preventing the one who recites the verse of Al-Kursi after each obligatory prayer from entering Paradise, except being alive.” [An-Nasaa’i].
* Giving in charity.
Huthayfah, radhiallah ‘anhu, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “Anyone who spends in charity sincerely for the sake of Allah, and dies upon doing it, will be admitted into Paradise.” [Ahmad].
* Financially supporting an orphan.
Sahl ibn Sa’d, radhiallah ‘anhu, narrated that the Prophet said: “I will be this close in Paradise to the one who financially supports an orphan (then he joined his middle and pointer fingers).” [Al-Bukhari].
* Guarding one’s tongue and private parts.
Sahl ibn Sa’d, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam , said: “Whosoever guards his tongue and his private parts, I will guarantee him Paradise.” (Bukhari).
* A wife obeying her husband.
Abu Hurayrah, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “If a woman prays her five obligatory prayers, fasts her month (of Ramadan), guards her private parts, and obeys her husband, she will enter Paradise from any gate she wishes.” [Ibn Hibbaan].
* Being free from arrogance, debt and stealing from war booty.
Thawbaan, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “The one who dies while being free from arrogance, debt and stealing from war booty will enter Paradise.” [Tirmithi].
* Being a just ruler, kindhearted, and chaste.
‘Iyaadh ibn Himaar, radhiallah ‘anhu, narrated that the Prophet,  sallallaahu‘alaihi wa sallam, said: “Three types (of people) are from the people of Paradise: a just ruler who correctly spends the money under his authority, a man who is kindhearted with his family and the Muslims in general, and a needy man with a family who does not ask people for help.” [Muslim].
* Removing harmful objects from the path.
Abu Hurayrah, radhiallah ‘anhu, narrated that he heard the Prophet, sallallaahu‘alaihi wa sallam, saying: “I saw a man enjoying himself in Paradise because he cut down a tree that was harming people which was in the middle of a path.” [Muslim].
* Giving respite to a person who cannot repay a debt.
Huthayfah, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “A man died and entered Paradise, he was asked, ‘What did you do (to gain Paradise)?’ he replied, ‘I used to trade and give extra time to those who could not repay me, and be easy on them if they only paid me partially, and I would overlook some of what they owed me.” [Muslim].
* Asking Allah The Almighty for Paradise three times and seeking refuge in Him from the Hellfire three times.
Anas, radhiallah ‘anhu, narrated that the Prophet, sallallaahu‘alaihi wa sallam, said: “When a person supplicates for Allah to admit him into Paradise three times, Paradise will say, ‘O Allah! Admit him into Paradise, and when a person seeks refuge in Allah from the Hellfire three times, the Hellfire will say, ‘O Allah! Protect him from the Hellfire.” [At-Tirmithi].
(Article source: http://www.islamweb.net/emainpage/)