Hey there,
For the achievement, only original titles from destiny 2 will work.
As for your code, you can head to your Bungie rewards (on the app tap the More icon in the bottom right then select Bungie rewards) and you should be able to send yourself a code.
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Thanks, not sure why it didn’t email like normal, but was able to sent myself a new email with the code. Bummer on the triumph achievement tho, guess I gotta finally finish that gambit one XD