Achroma Cards come in two different editions 1st Edition which is limited to the first 1200 runs of the cards and unlimited edition which have no limit and will continue to be printed.
Functionally there is no difference between the cards (other than unlimited may have updated card text) but Legendary and Rare cards have and embossed finish to the cards.
If you want to check your card you can enter the first 3 digits of the metacode below to find out which version it is.
Type at least 3 digits of your metacode to check