*Mild spoilers for objectives. It's basically impossible for you to stumble onto this challenge however. You have to
Demonstrate the repaired submarine to Rico Delgado.
Complete the statue unveiling ceremony.
Fix Rico's tattoo.
Help El Mijo feel better.
Return the lost love letter to Hector Delgado.
Cleanse the construction site.
Repair the hippie's cocaine souvenir.
Repair Jorge Franco's cocaine production machine.
I haven't attempted it yet but what a cool idea for a challenge. And the name is perfect. I won't say I fell out of my chair but I was like "Damn, that's good."