Andrew is named in all four Gospel lists of the twelve and in the Acts of the Apostles, always as the brother of Simon Peter and, like him, a fisherman of Bethsaida and Capernaum on the Sea of Galilee. Beyond the lists, the Synoptic Gospels say almost nothing of him. It is the Gospel of John that gives him a character.
There he is a disciple of John the Baptist who, hearing his teacher point to Jesus, follows and then fetches his brother, we have found the Messiah, so that in the Johannine account it is Andrew who brings Peter to Jesus, not the reverse. The Greek tradition that calls him Protokletos, the first-called, rests on this passage. John also places him at the feeding of the five thousand, as the disciple who notices the boy with the loaves, and has certain Greeks approach Jesus through him.
The name Andreas is itself Greek, meaning manly, which is unremarkable for a Galilean Jew of the period and tells us only that Greek names circulated in the region. Nothing in the New Testament reports where he went or how he died. Everything on those questions is later tradition, and the traditions do not agree.