When you complete the following tasks the corresponding character will become unlocked. These characters can be selected from the 'Character Select' staircase in the lobby.
Complete Zone 4 as Melody.
Complete Zone 4 as Monk.
Complete ALL Characters mode.
Defeat Dead Ringer as Cadence.
Complete Zone 2 with any character.
Complete Zone 1 with any character.
Complete Zone 4 as Cadence.
Complete Zone 3 with any character.
Complete the following Tasks to earn the listed achievement. To view your achievements and stats in Steam, select "Community", then search for the game hub that corresponds to [Crypt Of The NecroDancer]. Select the "View Stats" drop down option, then choose the option for your username's achievements.
Achievement - How to unlock
Bat Trick - Kill three green bats.
Heartthrob - Have 10 heart containers at the same time.
Merchanticide - Kill the shopkeeper.