A huge amount made it ashore in varying locations in Ulster, Connacht, and Munster. It could be a few hundred at one spot, maybe a dozen at another.

Some of you make it ashore and are captured by English forces. You're brought back to the local settlement or castle to be hanged. Others are met by local Irish but they attack you, hoping to salvage some of the goods from your wrecked ship. They might keep some of you alive to bring to the local English magistrate or ruler for hopes of a reward. Yet others of your countrymen are taken prisoner by the local Gaelic lords and kept to train their soldiers in the ways of war. The most fortunate of you are hidden by friendly Irish Gaels but there's no guarantee that you'll see your country again.

The experience varied by where the sailors landed and in what condition. One enterprising captain managed to get most of his men ashore with weapons in Connacht. He seized a local stronghold and held it until they could hail more passing Spanish vessels to take them off. Others just needed a spot to rest and repair their ship but some were forced ashore when they ran aground or took too much damage. A group of disciplined sailors would make any kern or scouts think twice while a few scattered survivors were easy pickings. It seems most of the noblemen captured were spared for ransom while the common sailors would have been put to death. Your chances of survival definitely improved based on your breeding!

Spanish ambassadors to the rebel Gaelic lords during the Nine Years War report meeting survivors of the Armada (this being nearly a decade on, in the 1590s) who pleaded to be brought home. They'd been kept in Ulster by the lord who saved them and forced to help train the new Irish armies being raised. The Spanish at the time generally found Ireland to be disagreeable, thinking both the climate and people were as savage as each other.

Sources:

Elizabeth's Irish Wars - Cyril Falls

Ireland: Graveyard of the Spanish Armada - T.P. Kilfeather

The Nine Years War - James O'Neill