Dramatized
Legend
Whoever told you they didn't faction changed lied to you.. Sorry to burst your bubble but if 2 of the worlds top F2P achievement people (lofi/visa) could only max out at under 850 it isn't possible. Also seasonal quests do not count towards it forever and there is again noway to get 3k quests or even 1k. Seasonal quests for the whole year resets after or before winters veil.
Also could you explain why this comes up? Looks like they were ally originally (or at some point) and did some quests (on a high and low level character) then faction changed to horde and didn't complete the quests
I've known Gemini from like 5 years back, we've been guildies. I know for a fact that character hasn't been faction changed. I challenge you to find one single piece of Alliance gear or any Alliance acheivement.
What you're missing in your calculation is that Lofi and all other f2p achieve hunters created their characters in Cataclysm, whereas Gemini has been around since Vanilla. He has done every Horde GF'd quest and every seasonal quest that gives you credit for this achievement during the years that've gone past. Unlike f2ps he has also not been restricted to only do quests in Azeroth, Outland and Northrend.
All seasonal quests doesn't reset, look at what [MENTION=16240]Goesid[/MENTION] wrote earlier.
As for the Alliance quests completed: I think that either it is some kind of bug, or that you were able to do some Defias-quests or similar before the Shattering took place - which could've given you Alliance quest credit. As you can see; there's two Loch Modan and two Westfall quest objectives for the Loremaster. Would it make any sense for the #1 achievement hunter to faction change Alliance and then only do the quest OBJECTIVES of Westfall and Loch Modan? Woudn't he had done any other achievements available to Alliance? He haven't even completed the Redrige Mountains quests, for instance.
I don't think he'd mind if you logged in-game and asked him himself.