• Unlock every character
• Complete every challenge night
• Complete every secret minigame
• Beat Lucid Nightmare

Unlike other custom night games, most characters must be unlocked by scoring points, which are gained by surviving a night and give more or less depending on how many characters were active and what level they were at. So, instead of prioritizing getting the criteria to unlock the challenges with the least characters first, you should prioritize the challenges that cost the least to buy every character.

So, the optimal route for the challenge nights completion section should be:

• Farmland Frenzy
• Into the Woods
• Carnival Carnage
• Step Right Up
• CircusCreeps.exe
• Trojan Detected