Legendary Collection Achievement Points
It is intended. You did not craft the precursor which is what those collections are for – precursor crafting.
What you could do is see if the cost to craft the precursor for Kudzu is cheaper enough than buying it from the TP and then craft it for the AP and sell the precursor for profit.
It’s intended. The achievements are tied to the precursor crafting only, not to the actual legendary. If you obtained a precursor via a drop or the forge, you do not auto unlock he achievements/collections.
So if you want those points, you need to craft the precursor, regardless as to how you obtained it before.
1. You would only need to craft the precursor to unlock all the achievements, not craft the whole legendary. If you’re that hell-bent on doing it you could craft it and then sell it.
2. It’s 9 AP with no title or additional collections and achievements tied to it. Don’t bother.
3. Yes it’s intentional. The point of this was to provide a one-time, zero RNG, gradual crafting process for precursors. Not to placate achievement kitten.