SelfImposedChallenge

Here are some things I've done - Kain Lupus

No-Damage Campaign Run (Hard Difficulty)

Perfect Knight on all Combat Challenges

Complete all Predator Challenges without being seen

I sometimes try to go for Flawless Freeflow but I find it's too much effort to enjoy (and I don't know if it's possible (without luck) if there's a Titan in the room)

Here's mine - MMTrigger

Earning all upgrades before getting to Croc's lair

Getting all possible Riddler trophies before moving to the next story objective.