At long last and After all

At long last adverb - As the end result of a succession or process.

After all and at long last are semantically related in in the end topic. In some cases you can use "After all" instead an adverb phrase "At long last", when it comes to topics like finally, eventually.

After all adverb - In spite of expectations.

At long last and after all are semantically related in in the end topic. You can use "At long last" instead an adverb phrase "After all", if it concerns topics such as finally, eventually.