Here is the full list of all 121 The Madness of Little Emma achievements.
Complete episode 2 without collecting hearts and healing herbs
Get very unlucky
Kill all bosses in episode 3
Kill Meat Bag
Complete episode 1 without collecting hearts and healing herbs
Complete Arena as Chloe
Complete Arena as Elizabeth
Kill 4 Seasons
Kill Spring
Complete Arena as Amelia
Kill April
Complete Arena as Emma
Get really insane!
Unlock Chloe
Complete Arena
Complete Arena as Lucretia
Kill Summer
Kill Winter
Kill Autumn
Unlock first ending
Kill a shopkeeper
Destroy a turnip
Find a red chest
Get very lucky
Kill Sinister Mask
Buy 5 items in one playthrough
Kill all bosses in episode 2
Kill the fat man
Have only 1 heart container
Unlock Lucretia
Kill Mask
Kill all bosses in episode 1
Kill Entozoon
Unlock Amelia
Find Love Burrow
Collect 5 health bonuses in one game
Reach Undergrounds
Unlock Elizabeth
Reach Misery
Kill Alice
Kill Red Viper
Reach Den
Kill Green Viper
Kill Liquid Sisters
Find a secret
Kill a boss
Kill Haunt
Die
Reach The Riddle
Unlock second ending
Unlock third ending
Unlock final ending
Kill all bosses in episode 4
Find everything
Complete ending 4 with clean mind all the time
Unlock every other achievement
Complete episode 3 without collecting hearts and healing herbs
Complete episode 4 without collecting hearts and healing herbs
Kill Manless Face
Kill Eidolon
Kill Spirit
Find all Love Items
Unlock fifth ending
Unlock sixth ending
Kill Manless Face as Amelia
Unlock Marah
Complete Arena as Marah