First
achievement - Denying prophet’s last wish, when prophet asked to bring
paper and pen to dictate something he denied by claiming that ‘we have
the book of Allah and it is sufficient to us’.
Second
achievement - He proposed Abubakr to be the first Caliph (Muslim ruler)
and took his sword out against those opposing him.
Third achievement - He prohibited Mutah which was allowed at the time of Prophet.
Fourth achievement - Taraweeh in Ramadan
Fifth achievement - Addition of ‘Assalatu Kahirum min an Nawm’ in Adhan.
Sixth achievement - Triple Talaq
Seventh achievement - Appointing Muawiyah as a governor of Syria
Eighth achievement - Leaving behind a useless son like Abdullah ibn Umar
Ninth achievement - Force women to wear Hijab. Otherwise he used to beat them.
Tenth achievement - He has followers like Taliban, Al-Qaeda, ISIS, Saudis etc.
The list is long but I would stop here.