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Dear Lord, I hated 'I would have been your daddy' for some weird reason I got it on the 1st or 2nd try but everytime I tried to help a friend get the skull it would take half a night ... grrr ... my favorite was probably a toss up between Legendary with Points on Halo 3 (only had 1 friend with me) and High Jump / Master Agent from Crackdown.

I have an Xbox 360 at my dad's house and i played madden NFL 08 there i had heaps of fun.

This isn't really one achievement but i got 425 gamerscore in one game (20 minutes) that would have to be all time favourite time

P.S the score was like 90 to 7

Pretty obscure but there's a minor achievement in Simpsos: the game for collecting all of Homer's bottlecaps ... there were two that seemed impossible to get and one afternoon I swore I'd get it.

It was the most satisfying achievement for me.

Have a nice day

Last best hope of humanity from Fallout 3 or I would have been your daddy achievement for Halo 3