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The Marvel blockbuster broke almost every record going last year, as fans flocked to the cinema in their millions to watch the band of superheroes protect the universe from the dastardly Thanos.
Raking in more than one billion dollars worldwide, it became one of the most successful movies ever made.
Its latest accolade comes from the folks over at film review site Rotten Tomatoes, with Endgame topping the charts ahead of eerie horror Us, Toy Story 4, Knives Out and coming of age comedy Booksmart to be named best release of the year.
The website, which awarded the flick 94 percent, said: "Exciting, entertaining, and emotionally impactful, Avengers: Endgame does whatever it takes to deliver a satisfying finale to Marvel's epic Infinity Saga
"Avengers: Endgame may have won the big prize for 2019, but we all know this movie isn't just an achievement marking one year, but a culmination of 11 years and over 20 films all wrapped into one blockbuster bonanza. Kudos to the Russo brothers for pulling it off."
James Cameron's epic sci-fi film held the record for a decade, having grossed $2.78 billion (£2.23bn). However, Endgame's worldwide gross came to $2.79bn (£2.14bn), smashing Avatar's record in the process.
In a statement, Alan Horn, Disney Studios co-chairman and chief creative officer, said the milestone was a testament to the 'power of movies'.
According to The Hollywood Reporter, he said: "A huge congratulations to the Marvel Studios and Walt Disney Studios teams, and thank you to the fans around the world who lifted Avengers: Endgame to these historic heights.
"Of course, even with the passage of a decade, the impact of James Cameron's Avatar remains as powerful as ever, and the astonishing achievements of both of these films are ongoing proof of the power of movies to move people and bring them together in a shared experience.
"The talented filmmakers behind these worlds have much more in store, and we look forward to the future of both the Marvel Cinematic Universe and Pandora [the setting for Avatar]."
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