I received the gravatron lance year 1 of D2and have never been able to get the catalyst for it. I took a long break from d2 to light fall, and have been playing almost daily since I have yet to receive the catalyst. I play crucible and vanguard stuff but it still elides me pleas help at this point I think I have a bug.
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i played destiny 2 for about 600 hours and own Graviton Lance since it came out, and i only got the catalyst last month, played only PVE if not a bug they really need to rework the drops on these things
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Wait for Xur to sell it
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Year 1 catalysts were meant to be nearly impossible to obtain but with Forsaken they changed this but didn't update year 1 catalysts. Your best bet is Xur as he sells catalysts and it's probably more likely he'll sell it then you'll obtain it.