Full list of sinful acts needs a book which is out of the space of this website. There are already many books published in this regard which you can refer to. Nevertheless, the main criterion in getting our Salah and other worship accepted is piousness تقوى as Allah (SWT) said in Sura 5, Verse 27: Allah only accepts from the pious إنما يتقبل الله من المتقين.

Being pious means avoiding any deliberate sinful act in our personal, family, social, financial social, etc life. It is not difficult for a Muslim with basic knowledge to know what are the sinful acts, then to try his best to avoid it. It will definitely need strong will power and continuous hard word to get rid of the sinful habits, but after all, it is worth putting every possible effort to purify ourselves from sinful acts.

Narrated Hadeeth Qudsi states that Allah says: I only accept Salah from the believer who is humble in front of My Greatness,

and did not feel big on my creatures because his Salah,

and who does not insist on sinful acts,

and who passes his day in remembering Me,

and who has sympathy on the poor and wayfarer and widow,

and who has mercy on the sufferer.

His light then will be like the light of the sun.

I will look after him by My Honor,

and My angles will protect him,

and I will grant him light from the darkness ,

and peaceful mind from ignorance ,

and he will be amongst my servants in the high Paradise.

Al-Ahadeeth al-Qudsiyyah.

Wassalam.