High RollerG 40

To cheese this achievement a bit, use the Challenge browser in the menu and check the New tab.
Every challenge that doesn't have any plays (a controller icon in the top right corner of a challenge) will grant you 5.2k influence per challenge.

If this is your last achievement of the Super7 update, you should be around the 6-7th level. Around a hour of exclusively playing challenges mentioned above should be enough to get this achievement.