Start a 3-player game.
Make sure one player completes a RED/PINK selfish task with a pitchfork icon (without being stopped by the others) and none of the other players do any selfish tasks.
Then make sure that selfish player wins the game by doing more tasks than the others.
Edit: You do not need to win a full game. Just finish a failed Day 1 with selfish player winning to get this quicker.