Achievement unlocked on Xbox but not Steam

My Xbox profile has 80 achievements unlocked and my Steam profile says I only have 78. One of the achievements I was able to cross examine was the one for being killed by the Guardians. I also cannot unlock the achievement for killing two vehicles with the target locator on Oni Sword Base. Not sure what the other straggler achievement is but I would love to hear input from others on this. Is there a way to fix it? Are we just stuck with our locked achievements never being accurate on both sides? I can unlock achievements as I unlocked the achievement for getting 1,000 campaign medals while I was trying to beat par time on Oni Sword Base and blow up the two vehicles.

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K