Οὗτος μὲν οὖν ἐκτήσατο χωρίον ἐκ μισθοῦ τῆς ἀδικίας, καὶ πρηνὴς γενόμενος ἐλάκησεν μέσος, καὶ ἐξεχύθη πάντα τὰ σπλάγχνα αὐτοῦ.
Now this man acquired a field with the reward of his unjust deed, and falling headfirst he burst open in the middle and all his intestines gushed out.
This is a vivid and rather horrifying description of Judas's end; it is the subject of much discussion, which the reader can find at the biblehub.com site, under 'Commentary' for Acts 1:18.
That οὗτος refers to Judas must be inferred from the context of previous verses.