They're both wrong. You must say either of the following: I will have arrived by 5 o'clock I will arrive at 5 o'clock I have no idea what "5 o'click" is.

Using the word arrived means this is a past tense it means you arrived already. You should say I will be arriving at 5:00 o'clock or I will arrive by 5:00 o'clock without the letter d.

James is right: "be arrived" makes no sense in English as "arrive" doesn't take an object. You do need the future perfect pattern (will have arrived) when using "by". It means your arrival is to happen any time before 5 o'clock. "At" refers to a specific point in time (or space). 5 o'clock is your arrival time.

when using BY, it means the action or the event will start before that time and be done by that time. I will be home by 5 pm - within 5 pm, I will reach home.(of course implying I will start for home before 5) When using AT, it just speak of the instance, the time mentioned. Let us meet at 6 pm = we will meet when the time is 6 pm (and the meeting may go on, no end time is mentioned) Hope this helps :)

By saying arrivied "by" 5 one means that they must be getting there prior 5, or around 5. meanwhile with arriving "at" 5 one gives one the inpresion that he is/was going to be in that place at 5 sharp