That requires you to play this game:
Temperia: Soul of Majestic
For 1 hour in order to get your Free Steam Key.
If you use Archies Steam Farm, but you don't know how to program it to play a specific game, keep reading.
If you're currently running Archies Steam Farm, you can type this into your web browser (Firefox works fine, open another Tab first) to input commands (Archies Steam Farm must be currently running).
http://localhost:1242/welcome 
Put this in the address bar of your browser, then hit Enter (In a seperate tab!).
Click Commands (on the left)
To Copy/Paste easily, use CTRL+C (Copy) then CTRL+V (Paste)
Copy/Paste this to Activate the game on your account (paste it in that big black command prompt)
!addlicense asf 267647
hit Enter (on your keyboard)
Wait until it says Status: OK/NoDetail
the game is now activated on your account
Next we need to
Pretend that we're playing the game
Copy/Paste this to Pretend to Play the game on your account (paste it in that big black command prompt)
!play asf 852780
Wait until it says Playing selected gameIDs: 852780
Now we can close that ASF | Commands tab in the Web Browser
To verify, you can open the Steam Client while running Archies Steam Farm (do not close ASF!)
Now open your Friends List, right next to your Profile Pic it should say your Username, then it should say
Temporia: Soul of Majestic

This is how we know we're "Playing" that game, come back after a little bit more than 1 hour and finish the rest of the requirements to earn this game:
Unlock your Steam key for the game Particula. Simply log in through Steam, complete a few tasks, and claim your free key!
opquests.com
After that amount of time, you can close Archies Steam Farm, when you open it again, it'll be playing a different game of yours to get Steam Cards, it wont play Temporia: Soul of Majestic again after that (unless you force it to).
This Mini-Guide is for people who use Archies Steam Farm, but never bothered to input commands (and would like to).