My greatest accomplishment would probably be earlier today. I was pretty bored in darkshire on my Druid when some BE rogue runs by on a mount. She didn't really look 70, but was on an epic mount, so I said "What the ****.." and got on my pally, when I got there I didn't see her but saw Redridge was under attack so I headed there.
As soon as I landed the 61 rogue (from earlier) and another, level 70 rogue is there. Of course, they started on me, so I threw up HS, conc and SoV and started working on the 61, she went dow extremely quickly, and for fun I saw how far I could get on the 70.. Reapplied HS consecration etc, got her down to 50%ish and was low on HP/mana, so I popped LoH and a mana pot, and finished her off. The rogue was probably a new 70, and very undergeared/skilled, but it was still a big accomplishmet for me...I killed my first 70, alone, at level 64, WITH a 61 fighting me as well. Got a few claps for that one from the lower levels there. :)
Kassira 70 Paladin, Vesthis 70 Druid
Tusaaya 34 Hunter
FFXI Server - Unicorn (retired)