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