GWENT The Witcher Card Game Guide

First off, some information that may be valuable to achievement hunters:
Achievements can only be unlocked in online matches, and not against bots.
However, as of now, matches against friends count as online matches! Therefore, you can play a friend and try to achieve a certain game status together. Some achievements will be a lot easier to obtain like this.
Players that come to Steam-Gwent with a lot of progress already will have trouble unlocking some of the achievements (no option to re-play the tutorial, no trigger to get leader skins, etc.). I will describe possible solutions for the achievements individually, but I can already tell you that in some cases there's only one option left: creating a second GOG account.
How long it will take you to get all of the 50 achievement is highly dependable on whether you already played a lot of Gwent before or not. Personally, I had them in 20-25 hours. However, I already had a full collection and was on prestige 2 when first playing through Steam.
For most of the deck-related and mechanic-related achievements I was assuming that the player has a full collection. I'm quite positive that all of them can be done with different (cheaper) decks, it will just be more difficult. If you need advice on possible card replacements, hit me up.
Don't confuse rank with level. Rank refers to your rank on the ladder and goes from 30 all the way up to 0. You can climb by playing ranked matches. Level on the other hand refers to your account level and goes from 1 to 60. After completing that, you start over at level 1 again, but on a new prestige level.