Paralyzed since the late 1990s, Achrekar had been unwell for a while and was under increased medical supervision since suffering a stroke in 2013.
Achrekar's academy in Mumbai's Shivaji Park area churned out several others who played for India, including Vinod Kambli, Praveen Amre, Ajit Agarkar and Ramesh Powar.
It was Achrekar who suggested to an 11-year old Tendulkar that he switch schools - from Bandra's New English School to Sharadashram Vidya Mandir - to better his cricketing pursuits.
As a player, Achrekar featured in a solitary first-class game for State Bank of India against a Hyderabad Cricket Association XI in 1960. He also briefly served as a Mumbai selector.
In 1990, Achrekar was conferred with the prestigious Dronacharya award for his services to cricket coaching. In 2010, he was awarded the Padma Shri, one of the highest civilian honours in India.
"Cricket in heaven will be enriched with the presence of Achrekar sir," Tendulkar said in a statement. "Like many of his students, I learnt my ABCD of cricket under sir's guidance. His contribution to my life cannot be captured in words. He built the foundation that I stand on.
Last month, I met sir along with some of his students and spent some time together. We shared a laugh as we remembered the old times. Achrekar sir taught us the virtues of playing straight and living straight. Thank you for making us a part of your life and enriching us with your coaching manual. Well played, sir, and may you coach more wherever you are."