Disney Epic Mickey 2: The Power of Two

For this achievement you'll need to collect 50% of all pins in the game. Naturally, you'll obtain this achievement on your way to collecting all pins for
People are unsure whether the pins in the first two levels are missable, so I'll list them here for the sake of completeness:

• In Yen Sid's Lab, paint the painting at the end of the level.

• In the Dark Beauty Castle, when you get to the machine, paint the wire above it to make some floating platforms appear. Jump to the top to find this pin on the balcony.

• From the above pin, go back the way you came and this time destroy the machine. The pin will be located directly behind it.

All pins are found in the world, bought in shops, or are obtained as quest rewards. If you've missed any pins throughout the game, they can be obtained from the pin trader in Mean Street North.