Hi, killed the boss in both difficulties, i got the acheviement : Let Me Solo Him: Nullaeus but i didnt get the mount why ?
I had a quick look at your profile and I’m not seeing the achievement listed. Ofc the armory could be slow to update.
If he really did, I will rule out the possibility of a daily or weekly loot lockout preventing the mount from dropping if the nemesis has been killed first on normal and later on hard mode, both within the same day.
From what I’ve seen first hand you could/should only strike out with crests including an extra chance for a piece of transmog (helmet, sword, staff etc which I know of) on repeat kills.
this is my profile
My French is rubbish but is this actually the let me solo him achievement?
Because that looks like this one:-
This is the Let me Solo Him achievement that awards the mount, and has to be done on your own with no other players (Valeera is allowed ofc):-
Hello, the french name should be : TĂŞte-Ă -tĂŞte : Vidaeus
Looks like you’ve already got this one
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I presume you’ve check your bags and the mailbox to see the mount isn’t there?
The Arcanovoid Construct mount appears to be in the bags of your Monk. Please make sure that you check all your bags, and use the in-game filter if necessary. 
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ok thx, i didnt know some mount are still in bags..
thx