Which Companion's visions used to come true?

There is no Companion known for all his visions coming true. However, if the question is about the Companion famous for the vision concerning the Prophet's ﷺ advent, then it is Amr ibn Murrah al-Juhani, may Allah be pleased with him. Amr hastened to Makkah after hearing about the call of the Prophet Muhammad ﷺ and informed him of his vision. Thereupon, Amr embraced Islam and bore witness that there is no god but Allah and that Muhammad is the Messenger of Allah. This report was transmitted by al-Tabarani, Ibn Asakir, and others.