Achu Rajamani belongs from a musical family background as his father and grandfather who was a perfectionist in music was well-known in the Malayalam music industry. They all had music as an extra language. Achu Rajamani was raised around music but he was interested in aviation and wanted to be a pilot but following the family legacy, chose music direction as his profession and quit over aviation. He got his breakthrough as a music director in the year 2008.

His first film was ‘Nenu Meeku Telusa’. Being a famous Tamil music director, he worked on his skills in which music director M.M Keeravani contributed by teaching him classical music. Achu completed his graduation from Loyola College, Chennai. Achu Rajamani marriage took place in Chennai on September 15, 2014.