Look in all peepholes and telescopes long enough to hear Edith's commentary

Collect all Time Capsules

Get Spectacular or better in a Spider-Training Traversal Challenge

Chase Tinkerer through the city

Catch 2 rabbits with only 2 swoops

Play Calvin's story again

See Johann's name in the ending credits

Knock all the letters of Gregory's name into the bathtub

Let the drunken sailor finish his song

Achieve The Special in every level (Single Player).

Collect all of the Red Bricks (Single Player).

Smash a chair as Bad Cop.

Customise your character.