To unlock the mission "Afterparty" and get to the credits as fast as possible, you need to complete a chain of missions, buy 6 Criminal Ventures & complete 2 of them. The current fastest known mission chain is:

First F#@!ing Day -> Morning Commute/Making Rent -> Observe and Report -> A Piece of the Action -> The Peter Principle -> Be Your Own Boss -> Take Me to Church -> Office Décor -> Networking -> Neenah's Car -> Idol Threat -> The Forge -> The Dustmoot -> Aggressive Recruiting -> The Frontier -> Drawing Heat -> Donut Run -> Corporate Retreat -> The Great Train Robbery -> Going Overboard -> Non-Compete Clause -> Severance Package -> Buy rest of the Ventures & Complete Eurekabator + Kraken Ventures -> After Party/High Noon -> Showdown.

To unlock "Drawing Heat", you need to place 3 Ventures & Complete "Agressive Recruiting", at that point you already have 2 placed Ventures, so you only have to place one.

You can skip "Drawing Heat" & "The Dustmoot", but if you skip "Drawing Heat", you don't have enough Ventures to buy, because you are still on Criminal Ventures tier 1 (And also "Eurekabator" unlocks on Tier 2).

"The Dustmoot" unlocks "Kraken" Venture, which is the fastest Venture in the game!

That's it for Glitchless routing of this game, I hope more people will pick up this game to evolve it even more.