What a game so far! Really enjoying and well worth the wait!
Here is the following video guide I used to obtain this achievement.
This is one of the many side missions in the game called "Fool on The Hill". You can start this side mission once you've scanned your first Tarot Card at Viktors, who is a ripperdoc.
There are a Total of 20 Tarot Cards. (+2 additional Tarot cards, however, you do not need them for this achievement)
You can fast travel to locations if you want, if they are far away, however I drove to most of them to help me get progress for the the achievement "Frequent Flyer" which is for 'Finding all fast travel dataterms.'
Video credits go to - Skull Busters