Already 4 great solutions related to this achievement here on TA, and still not exactly what I was looking for.
In case you would prefer visual aid like I do, I found these HQ vids on YouTube which you would've found anyways.
I'm only linking, I take no credits for it.
So, a BIG thanks goes to the author
Icarus Wings who took the time to record them and share these with the world on YouTube.
The thing I personally like about vids, is that they give me a good idea of what cards were used (look at the summary at the end of the vid), what the level looks like, what weapons (if applicable) to use, which path to take to build up and maintain the score combo multiplier, etc.
As already suggested by many others, it's better to go to the leaderboards and look for a gamer who used a set of cards you feel most comfortable with.
Personally, I think it's better to spend 2.000 Credits to have the perfect set of cards, because when you beat the level (and get gold), you will get 10.000 credits and thus still make 8.000 profits whilst having the perfect set of cards and not consume any of your own cards from your collection.
Alright then... on with the vids!
The Prophet's Tomb (Gold 165.000 points - Par time 10:30)
Siberian Wilderness (Gold 220.000 points - Par time 8:30)
Lost Expedition (Gold 29.000 points - Par time 3:30)
Soviet Installation (Gold 150.000 points - Par time 7:30)
Ancient Cistern (Gold 20.000 points - Par time 3:30)
Soviet Gulag (Gold 130.000 points - Par time 14:00)
Voice of God (Gold 11.000 points - Par time 3:30)
The Copper Mill (Gold 700.000 points - Par time 11:00)
The Red Mine (Gold 9.000 points - Par time 5:00)
The Prophet's Blessing (Gold 230.000 points - Par time 13:30)
House of the Afflicted (Gold 11.000 points - Par time 6:50)
The Village (Gold 230.000 points - Par time 7:00)
Catacomb of the Sacred Waters (Gold 8.000 points - Par time 4:00)
The Acropolis (Gold 160.000 points - Par time 5:00)
The Tower (Gold 110.000 points - Par time 7:00)
The Pit of Judgment (Gold 6.000 points - Par time 4:00)
Approaching Storm (Gold 143.000 points - Par time 8:30)
Flooded Archives (Gold 250.000 points - Par time 10:00)
Baths of Kitezh (Gold 12.000 points - Par time 8:30)
Research Base (Gold 160.000 points - Par time 15:10)
The Orrery (Gold 12.000 points - Par time 3:30)
Path of the Deathless (Gold 80.000 points - Par time 9:30)
Gate of Kitezh (Gold 44.000 points - Par time 9:30)
Chamber of Exorcism (Gold 5.000 points - Par time 5:30)
Outskirts of Kitezh (Gold 150.000 points - Par time 17:30)
The Lost City (Gold 29.000 points - Par time 4:30)
Chamber of Souls (Gold 85.000 points - Par time 11:00)
Return to the Wicked Vale (Gold 32.000 points - Par time 5:30)
(*)
Witch's Cave (Gold 32.000 points - Par time 15:20)
(*)
(*) Please note that the levels
Return to the Wicked Vale and
Witch's Cave are NOT needed for this particular achievement (Golden Child) since they are part of the Baba Yaga DLC, but they are needed if you're going for this achievement:
Any suggestions to improve this guide are welcome!
Thanks for voting thumbs up if this guide was helpful.
I wish you all the best of luck to get gold on all the levels of this fabulous game!