The Kukri is listed for the Vitalism in the game files, with no perk tree yet. Not in Early Access yet.
Kukri
Vitalism weapon · not in Early Access yet
Not in Early Access yet
No perk tree in the game files yet.
Early Access · build 26495283
Not in Early Access yet. The Kukri is in the game files but not in the game you can play now.
Vitalism Kukri FAQ
Is the Kukri in ArcheAge Chronicles?
Not in Early Access yet. It is in the game files for the Vitalism.
From the game files: Early Access · build 26495283