Found all concept art

Find all of Max's toys

Find all records

Perform a Battle Walker takedown

Find at least one of each collectible item

Acquire all Contraptions and Contraption upgrades

Decipher an Übercommander's location using the Enigma Machine

Wait for the game to resume after the credits

Beat the game on "Call me Terror-Billy!" difficulty or higher

Beat the game

Capture the Ausmerzer

Kill Hitler during the Aerostat Audition

Fully upgrade a weapon