with what does the Î¿Ï of the second line go?... is it trying to say something like: "for surely not Apollo..."?
The Î¼Î¬ indicates that he's swearing by Apollo. The Î¿á½ technically goes with the main clause starting on line 88 -- "by Apollo ... not ..." -- but the intervening stuff is so long that the Î¿á½ gets repeated. Maybe it'll help to get rid of some of the stuff and see that his main point is
Î¿Ï Î¼á½° Î³á½°Ï á¼‰Ï€ÏŒÎ»Î»Ï‰Î½Î± Ï„Î¹Ï‚ ÏƒÎ¿á½¶ Î²Î±ÏÎµÎ¯Î±Ï‚ Ï‡Îµá¿–ÏÎ±Ï‚ á¼Ï€Î¿Î¯ÏƒÎµÎ¹
but then he adds all the other stuff which makes the sentence more complicated.
Or, roughly speaking, you can read the Î¿á½ Î¼á½° á¼ˆÏ€ÏŒÎ»Î»Ï‰Î½Î± as "no, by Apollo."
the third line really gets me confused; am i right with saying that the verb at the end goes with the participle at the beginning? "praying you reveal to the Danaeans the prophecies"?... or not? lol...
I'm not sure what you mean for the verb to go with the participle, but because the participle is nominative it goes with the subject of the verb which is "you." Your translation is right but just in case, the á¾¦ goes with Îµá½Ï‡ÏŒÎ¼ÎµÎ½Î¿Ï‚ as well so (in pretty bad English) "praying to whom, you reveal..."
what is Î¿á½• Ï„Î¹Ï‚ ?... origionally i though it to be a form of Î¿ÏƒÏ„Î¹Ï‚ but grammatically it doesnt fit... Ï„Î¹Ï‚ is not in the genetive...
Ï„Î¹Ï‚ means "some(one), a certain (one)", so Î¿á½” Ï„Î¹Ï‚ means "not someone" or equivalently "no one."
Then also in this line there is the whole genetive absolute thing... which i still dont get lol...
If you're find with the uses of participles in general, the genitive absolute is used when the subject (or "subject" if you prefer) of the participle does not occur in the rest of the sentence. For example with Îµá½Ï‡ÏŒÎ¼ÎµÎ½Î¿Ï‚ before, the subject of Îµá½Ï‡ÏŒÎ¼ÎµÎ½Î¿Ï‚ is Calchas who is the subject of á¼€Ï€Î¿Ï†Î±Î¯Î½ÎµÎ¹Ï‚ and thus nominative, so the participle is nominative as well. But with Î¶á¿¶Î½Ï„Î¿Ï‚ and Î´ÎµÏÎºÎ¿Î¼ÎÎ½Î¿Î¹Î¿, they refer to Achilles but he plays no other role in the sentence so it's put into the genitive.
and why in line 90 is Îµá¼³Ï€Î·Î¹Ï‚ subjunctive?
Basically because of the á¼¤Î½ "if." One of the standard if-then construction is 'if+subjunctive, future'.